Update mypy requirement from ==1.14.0 to ==1.15.0

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@v1.14.0...v1.15.0)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -58,7 +58,7 @@ numpy = [
   { version = ">1.22.0,<2.0.0", markers = "python_version ~= '3.12'" },
   { version = ">1.22.0,<2.0.0", markers = "python_version ~= '3.13'" },
 ]
-mypy = "==1.14.0"
+mypy = "==1.15.0"
 pytest = "*"
 pytest-cov = "*"
 pytest-watch = "*"