Update dependency Polyfill to 9.7.6

Author: renovate[bot]

Directory.Packages.props

@@ -19,7 +19,7 @@
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />
 
     <PackageVersion Include="Nullable" Version="1.3.1" />
-    <PackageVersion Include="Polyfill" Version="9.7.4" />
+    <PackageVersion Include="Polyfill" Version="9.7.6" />
     <PackageVersion Include="JetBrains.Annotations" Version="2025.2.4" />
     <PackageVersion Include="JetBrains.Annotations.Sources" Version="2025.2.4" />
   </ItemGroup>