Bump Mypy version to v1.15.0 for tests

Author: Delgan

pyproject.toml

@@ -64,7 +64,8 @@ dev = [
   "mypy==v0.910 ; python_version<'3.6'",
   "mypy==v0.971 ; python_version>='3.6' and python_version<'3.7'",
   "mypy==v1.4.1 ; python_version>='3.7' and python_version<'3.8'",
-  "mypy==v1.14.1 ; python_version>='3.8'",
+  "mypy==v1.14.1 ; python_version>='3.8' and  python_version<'3.9'",
+  "mypy==v1.15.0 ; python_version>='3.9'",
   # Docs.
   "Sphinx==8.2.1 ; python_version>='3.11'",
   "sphinx-rtd-theme==3.0.2 ; python_version>='3.11'",