Update protobuf plugin

[loosebazooka]

Looks like the new protobuf plugin handles a few more things that the old one. Updates to remove unnecessary config that was breaking things.

Signed-off-by: Appu Goundan [email protected]

[loosebazooka]

I think staging is going through something, I'll wait for it come back and run these tests again.

[vlsi]

@loosebazooka , thanks.
Please replace dependsOn("generateProto", "generateJsonSchema2DataClass0") with dependsOn("generateJsonSchema2DataClass0") at the end of /sigstore-java/build.gradle.kts.
It looks like dependsOn("generateProto") is no longer needed.

[loosebazooka]

@vlsi thanks for filing those protobuf gradle plugin bugs, I was also gonna see if they would update their kotlin-dsl example.