deps: update dependency system.collections.immutable to 6.0.1 (#183)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Directory.Packages.props

@@ -5,7 +5,7 @@
     <PackageVersion Include="FSharp.Core" Version="[7.0.200,)" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageVersion Include="Microsoft.TestPlatform.ObjectModel" Version="17.11.1" />
-    <PackageVersion Include="System.Collections.Immutable" Version="[6.0.0,)" />
+    <PackageVersion Include="System.Collections.Immutable" Version="[6.0.1,)" />
   </ItemGroup>
 
 </Project>