fmt-maven-plugin versioning

[JesseLovelace]

It was raised in googleapis/java-storage-nio#1069 that the fmt-maven-plugin has moved to com.spotify.fmt

It looks like the fmt-maven-plugin dependency is pinned to specific version due to Java 8 compatibility. I believe that would mean we can't actually depend on com.spotify.fmt instead.

Is that the case, or would there be any way to move the dependency?

If we can't change the dependency feel free to close this, just wanted to make sure it's documented!

[blakeli0]

I think we could change it to the Spotify one by using the 2.9.x release based on their README, do we think it's worth it to switch to the Spotify plugin @suztomo?

[suztomo]

P3 nice to have feature. We also upgraded the release build to use Java 17. If only use format task in Java 17 only then upgrade should be easy.