fix(deps): pin 'google-{api,cloud}-core', 'google-auth' to allow 2.x versions (#82)
fix(deps): pin 'google-{api,cloud}-core', 'google-auth' to allow 2.x versions (#82)

Expand pins on library dependencies in preparation for these dependencies taking a new major version. See https://github.com/googleapis/google-cloud-python/issues/10566.
googleapis/python-memcache,googleapis/python-memcache