Investigate why Renovate is trying to run a complete Gradle build

[ChipWolf]

Renovate is currently failing because it seems to be trying to run a complete gradle build, then failing in a timeout.

[3arthqu4ke]

Because it changed the dependencies on mixin and unimined? Which all mods depend on, so they all need to be rebuild?

[ChipWolf]

We could run renovate in CI instead