[DOC] - update Java + cuDF docs with STABLE (26.06) on https://docs.rapids.ai/api/

[rockhowse]

Report needed documentation

Report needed documentation
We have released cuDF jar 26.06.0 on https://repo1.maven.org/maven2/ai/rapids/cudf/26.06.0

Could you please update the Javadoc on https://docs.rapids.ai/api

Describe the documentation you'd like
It looks like we need to add the STABLE (26.06) to the Java + cuDF section as it only currently has LEGACY (26.04)

The documentation should look similar to what is being done in the cuDF section (Example shown below)

Steps taken to search for needed documentation

It appears that these things are controlled via a .json file:

• https://github.com/rapidsai/docs/blob/main/ci/customization/projects-to-versions.json

And cudf-java only has the legacy entry

  "cudf-java": {
    "legacy": "26.04"
  },

Ideally we should be able to update this .json to include the following, and run through some of the scripts/README.md's in the repo to complete the update

  "cudf-java": {
    "legacy": "26.04"
    "stable":"26.06"
  },

[rockhowse]

It looks like there is one more piece to the puzzle after @jameslamb linked me the changes for the last release:

• https://github.com/rapidsai/docs/pull/777/changes

We also need to update the _data/docs.yml to ensure that stable: 1 is set for cudf-java