Modernize Build Tool Support

[trly]

Add Java 25 support to scip-java docker image
Add a skill file to quickly update all available LTS JVM versions in the docker image

Test plan

Ensured the docker image was able to be built locally and tested locally indexing a Java 25 based project

❯ podman run -v $(pwd):/sources \
  --env JVM_VERSION=25 \
  --env NODE_OPTIONS="--max-old-space-size=4096" \
  localhost/scip-java-test:latest scip-java index
...
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  02:59 min
[INFO] Finished at: 2026-01-14T20:19:14Z
[INFO] ------------------------------------------------------------------------
WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::arrayBaseOffset has been called by com.google.protobuf.UnsafeUtil$MemoryAccessor (file:/root/.cache/coursier/v1/https/repo1.maven.org/maven2/com/google/protobuf/protobuf-java/3.15.6/protobuf-java-3.15.6.jar)
WARNING: Please consider reporting this to the maintainers of class com.google.protobuf.UnsafeUtil$MemoryAccessor
WARNING: sun.misc.Unsafe::arrayBaseOffset will be removed in a future release
info: /sources/index.scip

❯ src code-intel upload -github-token=$GITHUB_TOKEN -root='commafeed-server'
💡 Inferred arguments
   repo: github.com/trly/commafeed
   commit: f651e6bb0be1e21c5fd85cde1852dbd2f0050d31
   root: commafeed-server
   file: index.scip
   indexer: scip-java
   indexerVersion: HEAD-20260114-1920

✅ Index compressed
💡 Indexed compressed (5.51MB -> 0.58MB).
✅ Index uploaded
💡 View processing status at https://demo.sourcegraph.com/github.com/trly/commafeed/-/code-intelligence/uploads/U0NJUFVwbG9hZDozMDY3NjAy