Bump mypy from 0.950 to 0.971 (#456)

* Bump mypy from 0.950 to 0.971

Bumps [mypy](https://github.com/python/mypy) from 0.950 to 0.971.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.950...v0.971)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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* Add automated changelog yaml from template for bot PR

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.changes/unreleased/Dependency-20220914-192102.yaml

@@ -0,0 +1,7 @@
+kind: "Dependency"
+body: "Bump mypy from 0.950 to 0.971"
+time: 2022-09-14T19:21:02.00000Z
+custom:
+  Author: dependabot[bot]
+  Issue: 417
+  PR: 456

dev-requirements.txt

@@ -13,7 +13,7 @@ flaky
 freezegun==0.3.9
 ipdb
 mock>=1.3.0
-mypy==0.950
+mypy==0.971
 pre-commit
 pytest-csv
 pytest-dotenv