Bump mypy from 1.8.0 to 1.9.0 (#525)

Bumps [mypy](https://github.com/python/mypy) from 1.8.0 to 1.9.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.8.0...1.9.0)

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

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

pyproject.toml

@@ -66,7 +66,7 @@ style = [
 lint = [
     "circuit-knitting-toolbox[style]",
     "pydocstyle==6.3.0",
-    "mypy==1.8.0",
+    "mypy==1.9.0",
     "reno>=3.4.0",
     "pylint==3.1.0",
     # pydocstyle prefers to parse our pyproject.toml, hence the following line