chore: pin versions of dependencies for compatibility with Python 3.6 (#1588)#866

diegomarquezp merged 3 commits intomaingoogleapis/java-kms:mainfrom

owl-bot-update-lock-6566dc8226f20993af18e5a4e7a2b1ba85a292b02dedb6a1634cf10e1b418fa5googleapis/java-kms:owl-bot-update-lock-6566dc8226f20993af18e5a4e7a2b1ba85a292b02dedb6a1634cf10e1b418fa5Copy head branch name to clipboard