Update mypy requirement from ==1.14.0 to ==1.15.0 (#633)

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
...

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Author: dependabot[bot]

pyproject.toml

@@ -62,7 +62,7 @@ dev = [
   "tomli-w",
   "msgpack",
   "numpy>1.22.0,<3.0.0",
-  "mypy==1.19.0",
+  "mypy==1.19.1",
   "black==25.12.0",
   "pyright==1.1.407",
   "ruff==0.14.9",