feat: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - c8 from 9.1.0 to 10.1.2.
    See this package in npm: https://www.npmjs.com/package/c8
  - chai from 4.5.0 to 5.1.1.
    See this package in npm: https://www.npmjs.com/package/chai
  - mocha from 8.4.0 to 10.7.3.
    See this package in npm: https://www.npmjs.com/package/mocha

See this project in Snyk:
https://app.snyk.io/org/cachiman/project/b96194dd-c3f1-4ceb-b70c-919f4b3c8ce9?utm_source=github&utm_medium=referral&page=upgrade-pr

packages/google-cloud-beyondcorp-clientgateways/samples/package.json

@@ -17,8 +17,8 @@
     "@google-cloud/clientgateways": "^1.1.0"
   },
   "devDependencies": {
-    "c8": "^9.0.0",
-    "chai": "^4.2.0",
-    "mocha": "^8.0.0"
+    "c8": "^10.1.2",
+    "chai": "^5.1.1",
+    "mocha": "^10.7.3"
   }
 }