[DATALAD RUNCMD] Switch to 3.9 where was 3.8

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "sed -i -e 's,3\\.8,3.9,g' templates/.github/workflows/test-*",
 "dsid": "6b923cfa-a6c6-4bae-941d-e92f6afd5fcb",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

templates/.github/workflows/test-{{extension.name}}-{{datalad_branch}}.yaml

@@ -62,10 +62,10 @@ jobs:
       run: |
         git config --global user.email "[email protected]"
         git config --global user.name "GitHub Almighty"
-    - name: Set up Python 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v4
       with:
-        python-version: 3.8
+        python-version: 3.9
     - name: Install DataLad ({{ datalad_branch }})
       run: |
         python -m pip install --upgrade pip