Allow System.Collections.Immutable to be Version 5.*.*

Author: Mafii

Packages.props

@@ -4,7 +4,7 @@
 		<PackageReference Update="Autofac" Version="$(AutofacVersion)" />
 		<PackageReference Update="Autofac" Version="[5.1.2, 7)" Condition="'$(AutofacVersion)' == '' Or '$(AutofacVersion)' == 'lowestSupported'" />
 		<PackageReference Update="Microsoft.NET.Test.Sdk" Version="[15.9.2, 16)" />
-		<PackageReference Update="System.Collections.Immutable" Version="[1.6, 2)" />
+		<PackageReference Update="System.Collections.Immutable" Version="[1.6, 6)" />
 		<PackageReference Update="xunit" Version="[2.4.1, 3)" />
 		<PackageReference Update="xunit.runner.visualstudio" Version="[2.4.1, 3)" />
 		<PackageReference Update="Messerli.CodeStyle" Version="[1.2.1, 2)" />