🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Author: gcf-owl-bot[bot]

renovate.json

@@ -8,12 +8,5 @@
   "ignorePaths": [".pre-commit-config.yaml", ".kokoro/requirements.txt", "setup.py", ".github/workflows/unittest.yml"],
   "pip_requirements": {
     "fileMatch": ["requirements-test.txt", "samples/[\\S/]*constraints.txt", "samples/[\\S/]*constraints-test.txt"]
-  },
-  "packageRules": [
-    {
-      "matchFileNames": ["requirements.txt"],
-      "matchStrings": ["geoalchemy2 (.*); python_version == '3.9'"],
-      "allowedVersions": ">= 0.17.1, < 0.18.0"
-    }
-  ]
+  }
 }