py-*: Add Python 3.14 and some updates

[judaew]

• py-uri-template: Add Python 3.14 subport
• py-rfc{3339,3986}-validator: Add Python 3.14 subport
• py-jsonpointer: Add Python 3.14 subport
• py-isoduration: Add Python 3.14 subport
• py-paramiko: Add Python 3.14 subport
• py-resolvelib: Add Python 3.14 subport
• py-referencing: Update to 0.37.0; add Python 3.14 subport
• py-jsonschema: Add Python 3.14 subport
• py-jsonschema-specifications: Update to 2025.9.1; add Python 3.14 subport
• py-rpds-py: Add Python 3.14 subport
• py-ruamel-yaml-clib: Update 0.2.15; add Python 3.14 subport

Description

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 15.7.2 24G325 x86_64
Command Line Tools 26.1.0.0.1.1761104275

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[macportsbot]

Notifying maintainers:
@michaelld for port py-ruamel-yaml-clib.
@stromnov for port py-jsonschema-specifications, py-jsonschema, py-paramiko.

[judaew]

This PR is a split-out from #30195. The original PR became too large, and the CI logs are now difficult to read, making it hard to understand why the macOS-14 test is failing. The idea here is to isolate part of the changes and then rebase the original PR on top of this one.