fix: packages/gcf-utils/package.json to reduce vulnerabilities

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

packages/gcf-utils/package.json

@@ -23,7 +23,7 @@
     "@google-cloud/run": "^0.3.0",
     "@google-cloud/secret-manager": "^4.1.2",
     "@google-cloud/storage": "^6.4.1",
-    "@google-cloud/tasks": "^3.0.2",
+    "@google-cloud/tasks": "^4.0.0",
     "@octokit/auth-app": "^4.0.5",
     "@octokit/plugin-enterprise-compatibility": "^2.0.3",
     "@octokit/rest": "^19.0.4",
@@ -41,7 +41,7 @@
     "express": "^4.18.1",
     "gaxios": "^5.0.1",
     "get-stream": "^6.0.1",
-    "google-gax": "^3.5.2",
+    "google-gax": "^4.0.0",
     "into-stream": "^6.0.0",
     "jsonwebtoken": "^9.0.0",
     "octokit-auth-probot": "^1.2.8",