CI: Stop maintaining version 1.13 and maintain version 1.16

[zhzhuang-zju]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
CI: Stop maintaining version 1.13 and maintain version 1.16

Which issue(s) this PR fixes:

Part of #6949

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

None

[gemini-code-assist]

Summary of Changes

Hello @zhzhuang-zju, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request performs a cleanup by updating the project's maintenance strategy for different versions. It stops actively maintaining version 1.13 and shifts focus to version 1.16. This is reflected in both the automated dependency update configurations and the user-facing compatibility documentation, ensuring that the project's CI processes and public information are aligned with the current support policy.

Highlights

• Dependabot Configuration Update: The Dependabot configuration for Docker package ecosystems has been updated to shift the target branches. Specifically, release-1.15 is now release-1.16, release-1.14 is now release-1.15, and release-1.13 is now release-1.14. This change reflects the project's updated version maintenance strategy.
• Documentation Update: The README.md file has been updated to reflect the new version compatibility matrix. The entry for Karmada v1.13 has been removed, and a new entry for Karmada v1.16 has been added, showing its compatibility with various Kubernetes versions.

Ignored Files

• Ignored by pattern: .github/workflows/** (2)
  • .github/workflows/ci-image-scanning-on-schedule.yml
  • .github/workflows/ci-schedule-compatibility.yaml

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request effectively updates the CI configuration in .github/dependabot.yml to reflect the shift in maintenance focus from version 1.13 to 1.16. Additionally, the README.md file has been updated to remove the compatibility entry for Karmada v1.13 and introduce Karmada v1.16, aligning the documentation with the new maintenance strategy. The changes are clear, consistent, and directly address the stated objective of the pull request.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.61%. Comparing base (196dcf9) to head (e87fca9).
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6993      +/-   ##
==========================================
- Coverage   46.61%   46.61%   -0.01%     
==========================================
  Files         699      699              
  Lines       48156    48156              
==========================================
- Hits        22448    22447       -1     
- Misses      24013    24014       +1     
  Partials     1695     1695              

Flag	Coverage Δ
unittests	46.61% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [RainbowMango]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment