[FSSDK-12032] chore: prepare for release 5.1.1#520

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FarhanAnjum-opti merged 2 commits intomasterfrom

farhan/FSSDK-12032-patch-release

Jan 20, 2026

Commits on Jan 20, 2026

chore: update Java Core SDK version to 4.3.1 and document changes in changelog
FarhanAnjum-opti
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chore: update changelog for release 5.1.1 with enhancements and fixes
FarhanAnjum-opti
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