fix: suppress gosec G706 on dev-tool log line

DEV_OS/DEV_ARCH are trusted build-time env vars set by CI, not user
input. Add nolint:gosec to match the fix already present on main.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: macdewee

dev-tools/mage/gotest.go

@@ -408,6 +408,7 @@ func GoTest(ctx context.Context, params GoTestArgs) error {
 		if raceAmd64 || raceArm64 {
 			testArgs = append(testArgs, "-race")
 		} else {
+			//nolint:gosec // G706: DEV_OS/DEV_ARCH are trusted build-time env vars, not untrusted input
 			log.Printf("Warning: skipping -race flag for unsupported platform %s/%s\n", devOS, devArch)
 		}
 	}