Update default bundle to 2.25.4

[github-actions]

This pull request updates the default CodeQL bundle, as used with tools: linked and on GHES, to 2.25.4.

[Copilot]

Pull request overview

Updates the action’s default CodeQL bundle/CLI version to 2.25.4 so that tools: linked (and the GHES-linked default) uses the new bundle by default.

Changes:

• Bump bundleVersion / cliVersion defaults to 2.25.4 and roll forward the prior* versions.
• Update the UNRELEASED changelog entry to reflect the new default bundle version.
• Regenerate the compiled lib/ artifacts to reflect the updated defaults.

Show a summary per file

File	Description
src/defaults.json	Updates default and prior CodeQL bundle/CLI versions to 2.25.4/2.25.3.
CHANGELOG.md	Adds an UNRELEASED entry documenting the default bundle bump to 2.25.4.
lib/upload-sarif-action.js	Generated build output reflecting updated defaults.
lib/upload-lib.js	Generated build output reflecting updated defaults.
lib/start-proxy-action.js	Generated build output reflecting updated defaults.
lib/setup-codeql-action.js	Generated build output reflecting updated defaults.
lib/init-action.js	Generated build output reflecting updated defaults.
lib/init-action-post.js	Generated build output reflecting updated defaults.
lib/defaults.json	Generated copy of defaults reflecting updated versions.
lib/autobuild-action.js	Generated build output reflecting updated defaults.
lib/analyze-action.js	Generated build output reflecting updated defaults.

Copilot's findings

• Files reviewed: 2/11 changed files
• Comments generated: 0