chore(deps): update go to 1.27.1

[taigrr]

Summary

• update the module Go directive to the current release verified from go.dev, go1.27.0
• tighten the existing GitHub Actions workflow with explicit branch filters, read-only contents permission, setup-go cache, and named steps

Verification

• go generate ./...
• go test -race ./...
• go vet ./...
• go build ./...
• staticcheck ./...