fix(deps): update dependency gcp-metadata to v8 (#2158)

Author: renovate-bot

package.json

@@ -20,7 +20,7 @@
     "base64-js": "^1.3.0",
     "ecdsa-sig-formatter": "^1.0.11",
     "gaxios": "^7.0.0",
-    "gcp-metadata": "^7.0.0",
+    "gcp-metadata": "^8.0.0",
     "google-logging-utils": "^1.0.0",
     "gtoken": "^8.0.0",
     "jws": "^4.0.0"