This change is needed to bump the mypy version

(py3816) partheniou@partheniou-vm-3:~/git/python-pubsub$ git diff
diff --git a/noxfile.py b/noxfile.py
index 3f9db8b..775e0be 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -32,7 +32,7 @@ BLACK_VERSION = "black[jupyter]==23.7.0"
 ISORT_VERSION = "isort==5.11.0"
 LINT_PATHS = ["docs", "google", "tests", "noxfile.py", "setup.py"]
 
-MYPY_VERSION = "mypy==0.910"
+MYPY_VERSION = "mypy==1.8.0"

In addition, the mypy failures would need to be addressed

(py3816) partheniou@partheniou-vm-3:~/git/python-pubsub$ nox -s mypy
nox > Running session mypy
nox > Creating virtual environment (virtualenv) using python3.8 in .nox/mypy
nox > python -m pip install -e '.[all]'
nox > python -m pip install mypy==1.8.0
nox > python -m pip install types-protobuf types-setuptools
nox > python -m pip install 'google-api-core[grpc]>=2.1.1' 'google-cloud-core>=2.2.0'
nox > mypy -p google.cloud
google/cloud/pubsub_v1/subscriber/_protocol/helper_threads.py:35: error: Incompatible default for argument "max_items" (default has type "None", argument has type "int")  [assignment]
google/cloud/pubsub_v1/subscriber/_protocol/helper_threads.py:35: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
google/cloud/pubsub_v1/subscriber/_protocol/helper_threads.py:35: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
google/cloud/pubsub_v1/subscriber/scheduler.py:165: error: Value of type "Iterable[Any]" is not indexable  [index]
google/cloud/pubsub_v1/publisher/_sequencer/unordered_sequencer.py:110: error: Argument "batch_done_callback" has incompatible type "None"; expected "Callable[[bool], Any]"  [arg-type]
google/cloud/pubsub_v1/subscriber/futures.py:107: error: Argument 1 of "result" is incompatible with supertype "Future"; supertype defines the argument type as "Optional[float]"  [override]
google/cloud/pubsub_v1/subscriber/futures.py:107: note: This violates the Liskov substitution principle
google/cloud/pubsub_v1/subscriber/futures.py:107: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#incompatible-overrides
google/cloud/pubsub_v1/subscriber/futures.py:107: error: Incompatible default for argument "timeout" (default has type "None", argument has type "Union[int, float]")  [assignment]
google/cloud/pubsub_v1/subscriber/futures.py:107: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
google/cloud/pubsub_v1/subscriber/futures.py:107: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
google/cloud/pubsub_v1/publisher/futures.py:48: error: Argument 1 of "result" is incompatible with supertype "Future"; supertype defines the argument type as "Optional[float]"  [override]
google/cloud/pubsub_v1/publisher/futures.py:48: note: This violates the Liskov substitution principle
google/cloud/pubsub_v1/publisher/futures.py:48: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#incompatible-overrides
google/cloud/pubsub_v1/publisher/futures.py:48: error: Incompatible default for argument "timeout" (default has type "None", argument has type "Union[int, float]")  [assignment]
google/cloud/pubsub_v1/publisher/futures.py:48: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
google/cloud/pubsub_v1/publisher/futures.py:48: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
google/cloud/pubsub_v1/publisher/_batch/thread.py:93: error: Incompatible default for argument "batch_done_callback" (default has type "None", argument has type "Callable[[bool], Any]")  [assignment]
google/cloud/pubsub_v1/publisher/_batch/thread.py:93: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
google/cloud/pubsub_v1/publisher/_batch/thread.py:93: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
google/cloud/pubsub_v1/subscriber/_protocol/streaming_pull_manager.py:48: error: Module "google.rpc" has no attribute "status_pb2"  [attr-defined]
google/cloud/pubsub_v1/subscriber/_protocol/streaming_pull_manager.py:270: error: Incompatible default for argument "scheduler" (default has type "None", argument has type "ThreadScheduler")  [assignment]
google/cloud/pubsub_v1/subscriber/_protocol/streaming_pull_manager.py:270: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
google/cloud/pubsub_v1/subscriber/_protocol/streaming_pull_manager.py:270: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
google/cloud/pubsub_v1/subscriber/client.py:254: error: Argument "scheduler" to "StreamingPullManager" has incompatible type "Optional[ThreadScheduler]"; expected "ThreadScheduler"  [arg-type]
Found 11 errors in 8 files (checked 34 source files)
nox > Command mypy -p google.cloud failed with exit code 1
nox > Session mypy failed.

Upgrade to the latest version of mypy #1061

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