CI failing due to changes in ScalaPB build deps

[strophy]

Our build recently started failing with:

> [protoc_gen_scala 5/8] RUN gu install native-image:
0.240 Downloading: Release index file from oca.opensource.oracle.com
2.121 Error: Error reading component list: https://oca.opensource.oracle.com/gds/meta-data.json

This is likely due to the removal of GraalVM Updater from the image we use to build ScalaPB. Native Image should now be included with GraalVM directly, but it doesn't work. I've asked for help here scalapb/ScalaPB#1580