[AI-FSSDK] prepare for release csharp-sdk v4.3.0#406

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jaeopt wants to merge 2 commits intomasterfrom

ai/jaeopt/FSSDK-12546

Commits on May 4, 2026

[FSSDK-12546] prepare for release csharp-sdk v4.2.0
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Commits on May 5, 2026

[FSSDK-12546] release csharp v4.3.0
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