chore(google-cloud-bigtable): temporarily pin mypy (#16985)

See #16984

This PR is needed to unblock
#16981

Author: parthea

.librarian/generator-input/client-post-processing/bigtable-integration.yaml

@@ -565,8 +565,14 @@ replacements:
       def mypy(session):
           """Verify type hints are mypy compatible."""
           session.install("-e", ".")
+          # TODO(https://github.com/googleapis/google-cloud-python/issues/16984):
+          # Update to the latest version of mypy
           session.install(
-              "mypy", "types-setuptools", "types-protobuf", "types-mock", "types-requests"
+              "mypy<2.0.0",
+              "types-setuptools",
+              "types-protobuf",
+              "types-mock",
+              "types-requests",
           )
           session.install("google-cloud-testutils")
           session.run("mypy", "-p", "google.cloud.bigtable.data")

packages/google-cloud-bigtable/noxfile.py

@@ -167,8 +167,14 @@ def format(session):
 def mypy(session):
     """Verify type hints are mypy compatible."""
     session.install("-e", ".")
+    # TODO(https://github.com/googleapis/google-cloud-python/issues/16984):
+    # Update to the latest version of mypy
     session.install(
-        "mypy", "types-setuptools", "types-protobuf", "types-mock", "types-requests"
+        "mypy<2.0.0",
+        "types-setuptools",
+        "types-protobuf",
+        "types-mock",
+        "types-requests",
     )
     session.install("google-cloud-testutils")
     session.run("mypy", "-p", "google.cloud.bigtable.data")