Update mypy requirement from <1.15.0,>=1.9.0 to >=1.9.0,<1.16.0

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@1.9.0...v1.15.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@ pytest>=8.1.1,<8.4.0
 autopep8>=2.1.0,<2.4.0
 flake8
 coverage
-mypy>=1.9.0,<1.15.0
+mypy>=1.9.0,<1.16.0
 build
 setuptools>=61.0
 types-setuptools