chore(deps): update actions/checkout action to v6 (#2523)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://redirect.github.com/actions/checkout) |
action | major | `v5` -> `v6` |

---

### Release Notes

<details>
<summary>actions/checkout (actions/checkout)</summary>

### [`v6`](https://redirect.github.com/actions/checkout/compare/v5...v6)

[Compare
Source](https://redirect.github.com/actions/checkout/compare/v5...v6)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "after 2am every weekday,before 5am
every weekday" in timezone America/Los_Angeles, Automerge - At any time
(no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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View the [repository job
log](https://developer.mend.io/github/aspect-build/rules_js).

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.github/workflows/buildifier.yaml

@@ -15,6 +15,6 @@ jobs:
     check:
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
             - name: buildifier
               run: bazel run //:buildifier.check

.github/workflows/ci.yaml

@@ -22,7 +22,7 @@ jobs:
     matrix-prep:
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
             - id: bazel-version
               name: Prepare 'bazel-version' matrix axis
               run: |
@@ -152,7 +152,7 @@ jobs:
         # Steps represent a sequence of tasks that will be executed as part of the job
         steps:
             # Checks-out your repository under github.workspace, so your job can access it
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
 
             # Setup an ssh keypair and github.com in known_hosts for e2e/git_dep_metadata,
             # which exercises fetching a git repository via ssh.

.github/workflows/mirror.yaml

@@ -11,7 +11,7 @@ jobs:
     mirror:
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
             - run: |
                   ./npm/private/versions_mirror.sh
                   npx @bazel/buildifier npm/private/versions.bzl

.github/workflows/tag.yaml

@@ -24,7 +24,7 @@ jobs:
             new-tag: ${{ steps.ccv.outputs.new-tag }}
             new-tag-version: ${{steps.ccv.outputs.new-tag-version}}
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
               with:
                   # Need enough history to find the prior release tag
                   fetch-depth: 0