Merge pull request #9 from ernado-x/dependabot/nuget/System.Collections.Immutable-8.0.0

Bump System.Collections.Immutable from 6.0.0 to 8.0.0

Author: ernado-x

src/X.Spectator/X.Spectator.csproj

@@ -22,7 +22,7 @@
 
     <ItemGroup>
       <PackageReference Include="JetBrains.Annotations" Version="2021.3.0" />
-      <PackageReference Include="System.Collections.Immutable" Version="6.0.0" />
+      <PackageReference Include="System.Collections.Immutable" Version="8.0.0" />
     </ItemGroup>
 
 </Project>