Bump Whisper.net.Runtime from 1.9.0 to 1.9.1 (#623)

---
updated-dependencies:
- dependency-name: Whisper.net.Runtime
  dependency-version: 1.9.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/OpenClaw.Shared/OpenClaw.Shared.csproj

@@ -18,7 +18,7 @@
   <!-- Audio / Speech-to-Text (platform-agnostic components) -->
   <ItemGroup>
     <PackageReference Include="Whisper.net" Version="1.9.0" />
-    <PackageReference Include="Whisper.net.Runtime" Version="1.9.0" />
+    <PackageReference Include="Whisper.net.Runtime" Version="1.9.1" />
     <PackageReference Include="Microsoft.ML.OnnxRuntime" Version="1.26.0" />
   </ItemGroup>