Bump mypy version

As it seems necessary for
"test-runner/wasi_test_runner/filters.py: make type annotation more strict"

```
wasi_test_runner/filters.py:26: error: Incompatible return value type (got "Tuple[bool, None]", expected "Union[Tuple[Literal[True], str], Tuple[Literal[False], None]]")  [return-value]
wasi_test_runner/filters.py:29: error: Incompatible return value type (got "Tuple[bool, Any]", expected "Union[Tuple[Literal[True], str], Tuple[Literal[False], None]]")  [return-value]
wasi_test_runner/filters.py:30: error: Incompatible return value type (got "Tuple[bool, None]", expected "Union[Tuple[Literal[True], str], Tuple[Literal[False], None]]")  [return-value]
```

test-runner/requirements/dev.txt

@@ -1,6 +1,6 @@
 -r common.txt
 flake8==5.0.4
-mypy==0.910
+mypy==0.991
 pylint==2.14.3
 pytest==6.2.5
-coverage==6.3.3
+coverage==6.3.3