Include gradle.properties in Gradle cache key

[jdubois]

Description:
Include **/gradle.properties in the default Gradle dependency-cache hash inputs so changes to dependency, plugin, or repository properties produce a new primary cache key.

This keeps the change focused on gradle.properties, updates the documented defaults and generated dist bundles, and adds a behavior test showing that changing only gradle.properties changes the computed key.

Prior art: #460 was closed after becoming stale and conflicted; maintainers invited a fresh focused PR.

Tests:

• node --experimental-vm-modules ./node_modules/jest/bin/jest.js --runInBand __tests__/cache.test.ts
• npm run check

Related issue:
Fixes #1222

Check list:

• Ran npm run check locally (format, lint, build, test) and all checks pass.
• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

This pull request updates the default Gradle dependency cache key inputs to include **/gradle.properties, ensuring that changes to Gradle properties affecting dependency/plugin/repository resolution will correctly rotate the primary cache key in actions/setup-java.

Changes:

• Add **/gradle.properties to the default Gradle dependency-cache hashing patterns.
• Update README documentation to reflect the new default Gradle key inputs.
• Update generated dist bundles and add a test asserting the cache key changes when only gradle.properties changes.

Show a summary per file

File	Description
src/cache.ts	Adds **/gradle.properties to the default Gradle dependency-cache key hash inputs.
README.md	Documents **/gradle.properties as part of the default Gradle key inputs.
dist/setup/377.index.js	Updates compiled setup bundle to include **/gradle.properties in Gradle patterns.
dist/cleanup/377.index.js	Updates compiled cleanup bundle to include **/gradle.properties in Gradle patterns.
tests/cache.test.ts	Updates existing Gradle-pattern assertions and adds a regression test for key rotation on gradle.properties changes.

Review details

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• Files reviewed: 3/5 changed files
• Comments generated: 0
• Review effort level: Lite