chore(deps-dev): bump mypy in /test-engineering/contract-tests/client (…

…#425)

Bumps [mypy](https://github.com/python/mypy) from 0.961 to 0.971.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.961...v0.971)

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

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

test-engineering/contract-tests/client/dev-requirements.txt

@@ -14,7 +14,7 @@ isort==5.10.1
     # via -r dev-requirements.in
 mccabe==0.6.1
     # via flake8
-mypy==0.961
+mypy==0.971
     # via -r dev-requirements.in
 mypy-extensions==0.4.3
     # via