[Sync] Update project files from source repository (f7c6655)

[mrz1836]

What Changed

• Updated actions/checkout action from v6.0.2 (commit de0fac2e) to v6.0.3 (commit df4cb1c0) across multiple workflow files and the warm-cache action
• Updated gitleaks/gitleaks-action from v2.3.9 (commit ff98106e) to v3.0.0 (commit e0c47f4f) in the fortress-security-scans workflow
• Bumped GOVULNCHECK_GO_VERSION from 1.26.3 to 1.26.4 in .github/env/00-core.env
• Applied the actions/checkout update consistently across 21 workflow and action files throughout the .github directory

Why It Was Necessary

• Updating to the latest actions/checkout version ensures access to bug fixes, security patches, and improvements in the checkout action
• The gitleaks-action v3.0.0 upgrade addresses the Node.js 20 deprecation warning mentioned in the inline comment, as the new version includes Node.js 24 support
• Keeping the govulncheck Go version current ensures vulnerability scanning uses the latest Go toolchain with the most recent security fixes

Testing Performed

• Verify all GitHub Actions workflows execute successfully with the updated action versions
• Confirm the gitleaks security scan completes without Node.js deprecation warnings using v3.0.0
• Validate that govulncheck runs properly with Go 1.26.4 and produces expected vulnerability reports
• Ensure checkout operations function correctly across all conditional paths in the warm-cache action (module cache hit/miss scenarios)

Impact / Risk

• Breaking Change: None - these are patch/minor version updates to actions that maintain backward compatibility
• Risk: Low - actions/checkout is a well-tested, stable action and the version change is incremental; gitleaks v3.0.0 is a major version but primarily updates the runtime environment
• CI/CD Impact: Positive - eliminates Node.js 20 deprecation warnings and ensures compatibility with GitHub Actions' latest runtime requirements

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mrz1836]

LGTM!