Fix GitHub Actions caching key in some integration tests

[Akshat-Jain]

Description

At a couple of places, we had 8 hardcoded as part of the caching key, which was a leftover since removal of Java 8. It should be updated to 17, as that's the build_jdk we are using now.

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This PR has:

• been self-reviewed.
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.