feat: allow updating security group on existing clusters (#123)
feat: allow updating security group on existing clusters (#123)

PiperOrigin-RevId: 383869440

Source-Link: https://github.com/googleapis/googleapis/commit/e2b7a98e29cabf5d7ee3c359939d8028bb1cca49

Source-Link: https://github.com/googleapis/googleapis-gen/commit/5476d7b26768d3d6c3c8c50b6b0fac42213d92c9
GoogleContainerTools/python-container,googleapis/python-container,GoogleContainerTools/python-container,googleapis/python-container