fix(deps): roll back dependency @google-cloud/datastore to ^7.2.0 (#1069)

Author: renovate-bot

samples/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout=600000"
   },
   "dependencies": {
-    "@google-cloud/datastore": "^7.3.0",
+    "@google-cloud/datastore": "^7.2.0",
     "sinon": "^15.0.0"
   },
   "devDependencies": {