Upgrade Actions to Node.js 24

Summary: Our GitHub Actions workflows are using deprecated Node.js 20, which will be removed from runners on September 16th, 2026.

Why We Need to Upgrade
Deprecation Timeline
Current State: Actions running on Node.js 20 (deprecated)
June 2nd, 2026: Node.js 24 becomes the default runtime
September 16th, 2026: Node.js 20 will be removed entirely from GitHub Actions runners
Impact if Not Upgraded
❌ Workflow failures starting June 2nd, 2026 (if actions don't support Node.js 24)
❌ Complete breakage after September 16th, 2026 (Node.js 20 removed)
❌ Security vulnerabilities from running unsupported Node.js versions
❌ Maintenance burden from using outdated dependencies
Benefits of Upgrading
✅ Future-proof workflows against runner changes
✅ Security improvements from latest Node.js LTS
✅ Performance gains from Node.js 24 optimizations
✅ Continued support from action maintainers

Required Action: Update to latest version supporting Node.js 24.

Start by inspecting the repository's GitHub Actions workflow files and identify actions still running on the deprecated Node.js 20 runtime. Update them to versions supporting Node.js 24, then verify the workflows remain valid and are configured to avoid the stated deprecation dates.