community/py3-google-api-python-client: upgrade to 1.8.2

Also fix missing dependency and enable check().

Before this change:

$ python3 -c 'import googleapiclient.discovery'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.8/site-packages/googleapiclient/discovery.py", line 49, in <module>
    import google.api_core.client_options
ModuleNotFoundError: No module named 'google.api_core'

After this change, python3 -c 'import googleapiclient.discovery' succeeds.

Change log: https://github.com/googleapis/google-api-python-client/blob/master/CHANGELOG.md#182-2020-04-21