Build(deps): Bump mypy from 0.990 to 0.991 in /dependencies/default (#446)

Bumps [mypy](https://github.com/python/mypy) from 0.990 to 0.991.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.990...v0.991)

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

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

dependencies/default/constraints.txt

@@ -7,7 +7,7 @@ hypothesis==6.56.4
 idna==3.4
 importlib-metadata==5.0.0
 iniconfig==1.1.1
-mypy==0.990
+mypy==0.991
 mypy-extensions==0.4.3
 outcome==1.2.0
 packaging==21.3