chore: set the default python version for templates to 3.10 (#1233)

* chore: set the default python version for templates to 3.10

* 🦉 Updates from OwlBot post-processor

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

* add workaround

---------

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

Author: parthea

.github/workflows/docs.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Setup Python
       uses: actions/setup-python@v5
       with:
-        python-version: "3.9"
+        python-version: "3.10"
     - name: Install nox
       run: |
         python -m pip install --upgrade setuptools pip wheel

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Setup Python
       uses: actions/setup-python@v5
       with:
-        python-version: "3.8"
+        python-version: "3.10"
     - name: Install nox
       run: |
         python -m pip install --upgrade setuptools pip wheel

.github/workflows/unittest.yml

@@ -42,7 +42,7 @@ jobs:
     - name: Setup Python
       uses: actions/setup-python@v5
       with:
-        python-version: "3.8"
+        python-version: "3.10"
     - name: Install coverage
       run: |
         python -m pip install --upgrade setuptools pip wheel

owlbot.py

@@ -30,6 +30,7 @@
 # Add templated files
 # ----------------------------------------------------------------------------
 templated_files = common.py_library(
+    default_python_version="3.10",
     unit_test_python_versions=["3.9", "3.10", "3.11", "3.12"],
     system_test_python_versions=["3.9", "3.11", "3.12"],
     cov_level=35,
@@ -53,6 +54,8 @@
         ".kokoro/build.sh",
         ".kokoro/continuous/common.cfg",
         ".kokoro/presubmit/common.cfg",
+        # Temporary workaround to update docs job to use python 3.10
+        ".github/workflows/docs.yml",
     ],
 )