Workflows failing due to updated git

[yngve-sk]

Workflows failing on linux for python 3.8, 3.9, 3.10, due to setuptools failing to parse trailing Z at timestamp generated by git command. Setuptools will likely be updated to handle this in near future, but until then we will not be able to run tests on linux without working around it.

Setuptools issue:
pypa/setuptools-scm#1038
There is a PR which will resolve it, but it is not yet merged:
https://github.com/pypa/setuptools_scm/pull/1039/files

        File "/tmp/pip-build-env-cqob0u5m/overlay/lib/python3.10/site-packages/setuptools_scm/_get_version_impl.py", line 35, in parse_scm_version
          return _entrypoints.version_from_entrypoint(
        File "/tmp/pip-build-env-cqob0u5m/overlay/lib/python3.10/site-packages/setuptools_scm/_entrypoints.py", line 55, in version_from_entrypoint
          maybe_version: version.ScmVersion | None = fn(root, config=config)
        File "/tmp/pip-build-env-cqob0u5m/overlay/lib/python3.10/site-packages/setuptools_scm/git.py", line 211, in parse
          return _git_parse_inner(
        File "/tmp/pip-build-env-cqob0u5m/overlay/lib/python3.10/site-packages/setuptools_scm/git.py", line 272, in _git_parse_inner
          node_date = wd.get_head_date() or datetime.now(timezone.utc).date()
        File "/tmp/pip-build-env-cqob0u5m/overlay/lib/python3.10/site-packages/setuptools_scm/git.py", line 131, in get_head_date
          return res.parse_success(
        File "/tmp/pip-build-env-cqob0u5m/overlay/lib/python3.10/site-packages/setuptools_scm/_run_cmd.py", line 77, in parse_success
          return parse(self.stdout)
        File "/tmp/pip-build-env-cqob0u5m/overlay/lib/python3.10/site-packages/setuptools_scm/git.py", line 121, in parse_timestamp
          return datetime.fromisoformat(timestamp_text).date()
      ValueError: Invalid isoformat string: '2024-05-06T07:28:45Z'
      [end of output]

Example failures:
https://github.com/equinor/ert/actions/runs/8966427993/job/24621915669
https://github.com/equinor/ert/actions/runs/8967021489/job/24623707207?pr=7840

[larsevj]

Issue seems to be due to updated git in our docker image for linux. Have to wait for new setuptools_scm before unpinning.