Bumps approvaltests from 17.4.3 to 18.0.5.

Sourced from approvaltests's releases.

PEP 625 compliance

Renames the file uploaded to mypy from approvaltests-minimal to approvaltests_minimal. This should have no affect visible to users, as pip will work the same either way.

#221

PEP 625 compliance

Renames the file uploaded to mypy from approvaltests-minimal to approvaltests_minimal. This should have no affect visible to users, as pip will work the same either way.

#221

fix release process

no user-facing changes

minor refactorings

No release notes provided.

Fix package metadata

Use the appropriate license tag to fix a warning produced with Python 3.10 packaging.

Removing support for Python 3.8 and 3.9

Our linter cleanup changed lots of things which might break importing in Python 3.8 and 3.9.

We also fixed approvaltests-minimal to declare its dependency on approval_utilities. (#251)

• 5ac8361 . e exec flag on setup/publish.approvaltests_minimal.sh
• f491573 v18.0.4 - PEP 625 compliance --------------
• cb0b649 ! r rename approvaltests-minimal -> approvaltests_minimal
• b0d939b . dt how to verify a dictionary
• 15f6603 . d tidy code and update markdown snippets
• 68cea4a - r extract function setup_approvals
• e911e0d - r rename function - setup_approvaltests
• 742402a - r delete dead code
• 54f021f v18.0.3 - fix release process --------------
• 1c1cba2 . e use textwrap.dedent
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