fix: packages/secret-rotator/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-MARKDOWNIT-6483324

packages/secret-rotator/package.json

@@ -35,7 +35,7 @@
     "@types/sinon": "^10.0.13",
     "c8": "^7.12.0",
     "gaxios": "^5.0.1",
-    "google-gax": "^3.5.2",
+    "google-gax": "^4.0.0",
     "gts": "^4.0.0",
     "lru-cache": "^7.14.0",
     "mocha": "^10.0.0",
@@ -44,7 +44,7 @@
     "typescript": "^4.8.2"
   },
   "dependencies": {
-    "@google-cloud/secret-manager": "^4.1.2",
+    "@google-cloud/secret-manager": "^5.0.0",
     "@googleapis/iam": "^3.0.1",
     "express": "^4.18.1",
     "gcf-utils": "^14.2.0",