Bump ICSharpCode.Decompiler from 7.0.0.6488 to 7.1.0.6543 (#47)

Bumps [ICSharpCode.Decompiler](https://github.com/icsharpcode/ILSpy) from 7.0.0.6488 to 7.1.0.6543.
- [Release notes](https://github.com/icsharpcode/ILSpy/releases)
- [Changelog](https://github.com/icsharpcode/ILSpy/blob/master/releasebuild.bat)
- [Commits](https://github.com/icsharpcode/ILSpy/commits)

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

src/ReactiveMarbles.ObservableEvents.Tests/ReactiveMarbles.ObservableEvents.Tests.csproj

@@ -21,7 +21,7 @@
     </PackageReference>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.10.0-3.final" />
     <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.2" PrivateAssets="all" />
-    <PackageReference Include="ICSharpCode.Decompiler" Version="7.0.0.6488" />
+    <PackageReference Include="ICSharpCode.Decompiler" Version="7.1.0.6543" />
   </ItemGroup>
 
   <ItemGroup>