Add `google-auth` as a direct dependency of generated clients

`google.auth` is imported in the generated code but is not declared as a direct dependency in `setup.py`. `google-auth` is pulled in transitively via `google-api-core`.

https://github.com/googleapis/gapic-generator-python/blob/cd0325b65729864881ade8388a14b315cb3ef0b4/gapic/templates/%25namespace/%25name_%25version/%25sub/services/%25service/client.py.j2#L25

https://github.com/googleapis/gapic-generator-python/blob/cd0325b65729864881ade8388a14b315cb3ef0b4/gapic/templates/setup.py.j2#L32-L36

https://github.com/googleapis/python-api-core/blob/5922f2b8f382ee1fd9b69fafb2eed39db93b60fb/setup.py#L34

This led to issue https://github.com/googleapis/google-cloud-python/issues/12254 because the minimum version of `google-auth` is not explicitly stated or tested.


	dependencies = [
	"google-api-core[grpc] >= 1.34.0, <3.0.0dev,!=2.0.,!=2.1.,!=2.2.,!=2.3.,!=2.4.,!=2.5.,!=2.6.,!=2.7.,!=2.8.,!=2.9.,!=2.10.*",
	"proto-plus >= 1.22.3, <2.0.0dev",
	{# Explicitly exclude protobuf versions mentioned in https://cloud.google.com/support/bulletins#GCP-2022-019 #}
	"protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",

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Add `google-auth` as a direct dependency of generated clients #1922

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Add google-auth as a direct dependency of generated clients #1922

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Add `google-auth` as a direct dependency of generated clients #1922