build: use mypy<1.11.0 until #682 is fixed

Author: parthea

noxfile.py

@@ -247,7 +247,7 @@ def pytype(session):
 @nox.session(python=DEFAULT_PYTHON_VERSION)
 def mypy(session):
     """Run type-checking."""
-    session.install(".[grpc]", "mypy")
+    session.install(".[grpc]", "mypy<1.11.0")
     session.install(
         "types-setuptools",
         "types-requests",