docs: align Java SDK documentation

[jonathannorris]

Summary

• Replace exact Java SDK versions with the compatible Maven-style range [2.9.3,3.0.0).
• Apply the range consistently to Maven, Gradle, and OpenFeature installation examples.
• Document that the range includes 2.9.3 and excludes 3.0.0.
• Document client shutdown for background workers and connections.

Validation

• git diff --check passed.

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Pull request overview

Updates the Java Server SDK documentation to use a consistent, compatible Maven/Gradle version range and adds guidance for properly shutting down the SDK client to stop background workers.

Changes:

• Replaced “LATEST” / Gradle + dependency versions with the Maven-style range [2.9.3,3.0.0) for Java Server SDK installs.
• Applied the same range consistently across the Java install and Java OpenFeature Provider docs (Maven + Gradle).
• Added a client.close() shutdown note to help users stop polling/connection/queue background work during application shutdown.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
docs/sdk/server-side-sdks/java/java-usage.md	Adds client shutdown guidance (client.close()) to prevent lingering background workers.
docs/sdk/server-side-sdks/java/java-openfeature.md	Aligns OpenFeature install examples (Maven/Gradle) to use [2.9.3,3.0.0) and documents the bounds.
docs/sdk/server-side-sdks/java/java-install.md	Aligns core Java SDK install examples (Maven/Gradle) to use [2.9.3,3.0.0) and documents the bounds.

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