Update supported GitHub Enterprise Server versions

[github-actions]

This PR updates the list of supported GitHub Enterprise Server versions, either because a new version is about to be feature frozen, or because an old release has been deprecated.

If an old release has been deprecated, please follow the instructions in CONTRIBUTING.md to deprecate the corresponding version of CodeQL.

[Copilot]

Pull Request Overview

Updates the minimum supported GitHub Enterprise Server version from 3.13 to 3.14 across compatibility definitions.

• Bumps minimumVersion in src/api-compatibility.json to 3.14
• Bumps minimumVersion in lib/api-compatibility.json to 3.14

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/api-compatibility.json	Updated minimumVersion from "3.13" to "3.14"
lib/api-compatibility.json	Updated minimumVersion from "3.13" to "3.14"

Comments suppressed due to low confidence (2)

lib/api-compatibility.json:1

• Please update CONTRIBUTING.md and any related documentation to reflect the deprecation of support for v3.13, as noted in the PR description.

{ "maximumVersion": "3.18", "minimumVersion": "3.14" }

src/api-compatibility.json:1

• Consider adding or updating tests to verify behavior at the new minimum supported version (3.14) and ensure edge cases around version boundaries are covered.

{"maximumVersion": "3.18", "minimumVersion": "3.14"}