deps: upgrade google-cloud-shared-dependencies to v2.7.0 (#1501)
deps: upgrade google-cloud-shared-dependencies to v2.7.0 (#1501)

This addresses gRPC CVE by upgarding to v1.44.0. Note that gRPC dropped Java 8 support in this version.

googleapis/java-bigquerystorage,googleapis/java-bigquerystorage,googleapis/java-bigquerystorage