chore: update dependabot settings

[averikitsch]

No description provided.

[averikitsch]

Error: google-github-actions/setup-gcloud failed with: failed to execute command `gcloud.cmd --quiet auth activate-****.gserviceaccount.com --key-file -`: C:/ProgramData/Chocolatey/lib/mingw/tools/install/mingw64/opt/bin/python.exe: can't find '__main__' module in ''
C:/ProgramData/Chocolatey/lib/mingw/tools/install/mingw64/opt/bin/python.exe: can't find '__main__' module in ''
Traceback (most recent call last):
  File "C:\hostedtoolcache\windows\gcloud\290.0.1\x64\lib\gcloud.py", line 95, in <module>
    main()
  File "C:\hostedtoolcache\windows\gcloud\290.0.1\x64\lib\gcloud.py", line 54, in main
    from googlecloudsdk.core.util import encoding
  File "C:\hostedtoolcache\windows\gcloud\290.0.1\x64\lib\googlecloudsdk\__init__.py", line 23, in <module>
    from googlecloudsdk.core.util import importing
  File "C:\hostedtoolcache\windows\gcloud\290.0.1\x64\lib\googlecloudsdk\core\util\importing.py", line 23, in <module>
    import imp
  File "C:\hostedtoolcache\windows\Python\3.9.[10](https://github.com/google-github-actions/setup-gcloud/runs/5379274526?check_suite_focus=true#step:5:10)\x64\lib\imp.py", line 23, in <module>
    from importlib import util
  File "C:\hostedtoolcache\windows\Python\3.9.10\x64\lib\importlib\util.py", line 2, in <module>
    from . import abc
  File "C:\hostedtoolcache\windows\Python\3.9.10\x64\lib\importlib\abc.py", line 17, in <module>
    from typing import Protocol, runtime_checkable
  File "C:\hostedtoolcache\windows\Python\3.9.10\x64\lib\typing.py", line 26, in <module>
    import re as stdlib_re  # Avoid confusion with the re we export.
  File "C:\hostedtoolcache\windows\Python\3.9.10\x64\lib\re.py", line [12](https://github.com/google-github-actions/setup-gcloud/runs/5379274526?check_suite_focus=true#step:5:12)4, in <module>
    import enum
  File "C:\hostedtoolcache\windows\gcloud\290.0.1\x64\lib\third_party\enum\__init__.py", line [26](https://github.com/google-github-actions/setup-gcloud/runs/5379274526?check_suite_focus=true#step:5:26), in <module>
    spec = importlib.util.find_spec('enum')
Attributemodule 'importlib' has no attribute 'util'

[craigdbarber]

I believe this is the result of gcloud not playing nice with Python3.9. I was able to resolve this by setting this env var:
export CLOUDSDK_PYTHON=python3.8

[craigdbarber]

Could be that some of the Windows VMs are now configured using Python3.9 by default? If so, this might be a more widespread issue.

[bharathkkb]

Newer versions of gcloud do support 3.9, I think we were just using a really old version in the versioned tests which was causing this ca069be