Update the gtm-session-fetcher submodule to v1.7.1.
Update the gtm-session-fetcher submodule to v1.7.1.

google/google-api-objectivec-client-for-rest,google/google-api-objectivec-client-for-rest,google/google-api-objectivec-client-for-rest,google/google-api-objectivec-client-for-rest,google/google-api-objectivec-client-for-rest