chore: Move mypy config into pyproject.toml for a more modern setup.

PiperOrigin-RevId: 820532696

Author: MarkDaoust

.github/workflows/mypy.yml

@@ -33,4 +33,4 @@ jobs:
           pip install -r requirements.txt
 
       - name: Run mypy  ${{ matrix.python-version }}
-        run: mypy google/genai/ --strict --config-file=google/genai/mypy.ini
+        run: mypy google/genai/

google/genai/mypy.ini

@@ -53,3 +53,12 @@ include-package-data = true
 
 [tools.setuptools.package_data]
 "google.genai" = ["py.typed"]
+
+[tool.mypy]
+exclude = ["tests/", "_test_api_client\\.py"]
+plugins = ["pydantic.mypy"]
+# we are ignoring 'unused-ignore' because we run mypy on Python 3.9 - 3.13 and
+# some errors in _automatic_function_calling_util.py only apply in 3.10+
+# 'import-not-found' and 'import-untyped' are environment specific
+disable_error_code = ["import-not-found", "import-untyped", "unused-ignore"]
+strict = true