Use unittest.mock on Python > 3.3

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[pipenv.exceptions.ResolutionFailure]: Warning: Your dependencies could not be resolved. You likely have a mismatch in your sub-dependencies.
  First try clearing your dependency cache with $ pipenv lock --clear, then try the original command again.
 Alternatively, you can use $ pipenv install --skip-lock to bypass this mechanism, then run $ pipenv graph to inspect the situation.
  Hint: try $ pipenv lock --pre if it is a pre-release dependency.
ERROR: Could not find a version that matches importlib-metadata==1.1.3,>=0.12,>=3.6 (from -r /tmp/pipenvvVDW1Yrequirements/pipenv-4xqldsc2-constraints.txt (line 4))
Tried: 0.0, 0.1, 0.1, 0.2, 0.2, 0.3, 0.3, 0.4, 0.4, 0.5, 0.5, 0.6, 0.6, 0.7, 0.7, 0.8, 0.8, 0.9, 0.9, 0.10, 0.10, 0.11, 0.11, 0.12, 0.12, 0.13, 0.13, 0.14, 0.14, 0.15, 0.15, 0.16, 0.16, 0.17, 0.17, 0.18, 0.18, 0.19, 0.19, 0.20, 0.20, 0.21, 0.21, 0.22, 0.22, 0.23, 0.23, 1.0.0, 1.0.0, 1.1.0, 1.1.0, 1.1.1, 1.1.1, 1.1.2, 1.1.2, 1.1.3, 1.1.3, 1.2.0, 1.2.0, 1.3.0, 1.3.0, 1.4.0, 1.4.0, 1.5.0, 1.5.0, 1.5.1, 1.5.1, 1.5.2, 1.5.2, 1.6.0, 1.6.0, 1.6.1, 1.6.1, 1.7.0, 1.7.0, 2.0.0, 2.0.0, 2.1.0, 2.1.0, 2.1.1, 2.1.1, 2.1.2, 2.1.2, 2.1.3, 2.1.3, 3.0.0, 3.0.0, 3.1.0, 3.1.0, 3.1.1, 3.1.1, 3.2.0, 3.2.0, 3.3.0, 3.3.0, 3.4.0, 3.4.0, 3.5.0, 3.5.0, 3.6.0, 3.6.0, 3.7.0, 3.7.0, 3.7.1, 3.7.1, 3.7.2, 3.7.2, 3.7.3, 3.7.3, 3.8.0, 3.8.0, 3.8.1, 3.8.1, 3.8.2, 3.8.2, 3.9.0, 3.9.0, 3.9.1, 3.9.1, 3.10.0, 3.10.0, 3.10.1, 3.10.1, 4.0.0, 4.0.0, 4.0.1, 4.0.1, 4.1.0, 4.1.0, 4.2.0, 4.2.0, 4.3.0, 4.3.0, 4.3.1, 4.3.1, 4.4.0, 4.4.0, 4.5.0, 4.5.0, 4.6.0, 4.6.0, 4.6.1, 4.6.1, 4.6.2, 4.6.2, 4.6.3, 4.6.3, 4.6.4, 4.6.4, 4.7.0, 4.7.0, 4.7.1, 4.7.1, 4.8.0, 4.8.0, 4.8.1, 4.8.1, 4.8.2, 4.8.2, 4.8.3, 4.8.3
There are incompatible versions in the resolved dependencies:
  importlib-metadata==1.1.3 (from -r /tmp/pipenvvVDW1Yrequirements/pipenv-4xqldsc2-constraints.txt (line 4))
  importlib-metadata>=0.12 (from pytest==7.0.1->-r /tmp/pipenvvVDW1Yrequirements/pipenv-4xqldsc2-constraints.txt (line 2))
  importlib-metadata>=3.6 (from twine==3.8.0->-r /tmp/pipenvvVDW1Yrequirements/pipenv-4xqldsc2-constraints.txt (line 6))

CI error seems unrelated.