Bump @actions/cache to 5.1.0, log cache write denied

[jasongin]

Description:

• Bump @actions/cache to v5.1.0 to pick up actions/toolkit#2435 Handle cache write error due to read-only token
• Update generated JavaScript files under dist
• Update license file for dependencies
• Add new test file for cache save operations. (This test coverage was oddly missing before.)
• Bump minor version in package.json from 6.2.0 to 6.3.0

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

This PR updates the action’s cache dependency to @actions/cache@5.1.0 (to better handle/cache-log read-only token write denials), bumps the action version to 6.3.0, and refreshes the generated dist bundles and dependency license metadata accordingly.

Changes:

• Bump @actions/cache from ^5.0.5 to ^5.1.0 and action version from 6.2.0 to 6.3.0.
• Add a cacheId === -1 handling path in src/cache-save.ts to avoid emitting misleading “saved” logs when the cache wasn’t saved.
• Regenerate dist/* bundles and update .licenses entry for the new cache version.

Show a summary per file

File	Description
src/cache-save.ts	Adds an explicit early-return (with debug log) when saveCache returns -1 (cache not saved).
package.json	Bumps package version to 6.3.0 and updates @actions/cache dependency to ^5.1.0.
package-lock.json	Updates lockfile to reflect 6.3.0 and @actions/cache@5.1.0.
dist/setup/index.js	Regenerated bundle incorporating @actions/cache@5.1.0 behavior/logging changes.
dist/cache-save/index.js	Regenerated bundle incorporating the new cacheId === -1 handling and updated cache dependency.
.licenses/npm/@actions/cache.dep.yml	Updates dependency license metadata to @actions/cache@5.1.0.

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• Files reviewed: 3/6 changed files
• Comments generated: 0