ci: Configure Renovate to keep Python at 3.10 for docs workflow (#2199)

* Configure Renovate to keep Python at 3.10 for docs workflow

This change adds a packageRule to `renovate.json` to prevent Renovate
from updating the Python version used in the `.github/workflows/docs.yml`
GitHub Actions workflow.

The rule specifically targets the `python-version` input of the
`actions/setup-python` step and restricts allowed versions to `<3.11`,
effectively pinning it to `3.10` for now.

* 🦉 Updates from OwlBot post-processor

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

* Update renovate.json

* 🦉 Updates from OwlBot post-processor

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

* adds files to excludes lists

* 🦉 Updates from OwlBot post-processor

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

* Update owlbot.py

* adds packageRule about pyproject.toml

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: 3 people

owlbot.py

@@ -65,6 +65,7 @@
     templated_files,
     excludes=[
         "noxfile.py",
+        "renovate.json",
         "docs/multiprocessing.rst",
         "docs/index.rst",
         ".coveragerc",
@@ -76,7 +77,7 @@
         ".kokoro/continuous/prerelease-deps.cfg",
         ".kokoro/samples/python3.7/**",
         ".kokoro/samples/python3.8/**",
-        ".github/workflows",  # exclude gh actions as credentials are needed for tests
+        ".github/workflows/**",  # exclude gh actions as credentials are needed for tests
         "README.rst",
     ],
 )

renovate.json

@@ -8,5 +8,12 @@
   "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": ["pyproject.toml"],
+      "matchStrings": ["matplotlib (.*); python_version == '3.9'"],
+      "allowedVersions": ">= 3.7.1, <= 3.9.2"
+    }
+  ]
 }