fix: Update golangci-lint to v2.5.0 for Go 1.25.2 compatibility

golangci-lint Version Update:
- Update from v1.63.0 to v2.5.0
- v2.5.0 supports Go 1.25.2 (v1.63.0 was built with Go 1.23)
- Fixes CI error: 'Go language version (go1.23) used to build golangci-lint is lower than targeted Go version (1.25.2)'

CI Pipeline Fix:
- .github/workflows/test-in-container.yml: golangci-lint v2.5.0
- Compatible with Go 1.25.2 target version
- Resolves version mismatch error in CI

Status: ✅ golangci-lint compatibility fixed
Next: Verify CI pipeline passes with golangci-lint v2.5.0