Bump mypy from 1.4.1 to 1.5.1

Bumps [mypy](https://github.com/python/mypy) from 1.4.1 to 1.5.1.
- [Commits](python/mypy@v1.4.1...v1.5.1)

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

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

requirements.txt

@@ -20,7 +20,7 @@ anyio==3.7.1
 black==23.7.0
 coverage[toml]==7.2.7
 ruff==0.0.277
-mypy==1.4.1
+mypy==1.5.1
 trio-typing==0.8.0
 types-certifi==2021.10.8.3
 pytest==7.4.0