Update speech sdk client-sdk version to 1.51.0

[HuapingLiu]

No description provided.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

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[learn-build-service-prod]

Learn Build status updates of commit ccd3229:

✅ Validation status: passed

File	Status	Preview URL	Details
metadata/latest/client-sdk.json	✅Succeeded

For more details, please refer to the build report.

[danieljurek]

Verified com.microsoft.cognitiveservices.speech:client-sdk:1.51.0 is published on Maven Central (POM available from repo1.maven.org).