Bump mypy to 0.981 (#8796)

requirements-tests.txt

@@ -5,7 +5,7 @@ flake8-bugbear==22.7.1  # must match .pre-commit-config.yaml
 flake8-noqa==1.2.9      # must match .pre-commit-config.yaml
 flake8-pyi==22.8.2      # must match .pre-commit-config.yaml
 isort==5.10.1           # must match .pre-commit-config.yaml
-mypy==0.971
+mypy==0.981
 packaging==21.3
 pycln==2.1.1            # must match .pre-commit-config.yaml
 pyyaml==6.0