feat(unleash): update to Unleash sdk 12

[liran2000]

update to Unleash sdk 12

can please review and merge

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated Maven dependency versions in providers/unleash/pom.xml for the Unleash client, SLF4J API, and Log4j SLF4J implementation.

Changes

Unleash dependency updates

Layer / File(s)	Summary
Dependency version updates providers/unleash/pom.xml	unleash-client-java is set to 12.2.2, slf4j-api is set to 2.0.18, and log4j-slf4j2-impl is set to 2.26.0.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly matches the main change: upgrading the Unleash SDK integration to version 12.
Description check	✅ Passed	The description clearly matches the dependency upgrade to Unleash SDK 12.

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