Update mypy requirement from <1.11,>=1.8 to >=1.8,<1.12 (#153)

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.8.0...v1.11)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:production
...

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

pyproject.toml

@@ -35,7 +35,7 @@ zulip = [
 tests = [
     "pytest>=7.4.4,<8.3.0",
     "types-PyYAML~=6.0.12",
-    "mypy>=1.8,<1.11"
+    "mypy>=1.8,<1.12"
 ]
 
 [project.scripts]