* Revert "Upgrade App Engine Standard to Java 17 w/ bundled APIs (#1714)"
This partially reverts commit d8e77e2ab2 (it keeps
intact unrelated version upgrades).
We need to temporarily revert this because Spinnaker isn't quite yet playing
nice with the new <app-engine-apis> configuration option in appengine-web.xml
(it seems like this was added recently and Spinnaker is still stuck on App
Engine SDK version 1.9.82 which predates it). Hopefully we can get that
dependency updated in Spinnaker soon and then we can re-upgrade to Java 17.