Bump mypy from 0.910 to 0.930 (#461)

* Bump mypy from 0.910 to 0.930

Bumps [mypy](https://github.com/python/mypy) from 0.910 to 0.930.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.910...v0.930)

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

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

* Update _exceptions.py

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

Author: dependabot[bot]

httpcore/_exceptions.py

@@ -3,7 +3,7 @@
 
 
 @contextlib.contextmanager
-def map_exceptions(map: Dict[Type[Exception], Type[Exception]]) -> Iterator[None]:
+def map_exceptions(map: Dict[Type, Type]) -> Iterator[None]:
     try:
         yield
     except Exception as exc:  # noqa: PIE786

requirements.txt

@@ -21,7 +21,7 @@ black==21.12b0
 coverage==6.2
 flake8==4.0.1
 isort==5.10.1
-mypy==0.910
+mypy==0.930
 pytest==6.2.5
 pytest-httpbin==1.0.1
 pytest-trio==0.7.0