Bump coverlet.collector and Microsoft.NETFramework.ReferenceAssemblies (#1856)

Author: dependabot[bot]

Directory.Packages.props

@@ -3,7 +3,7 @@
   <ItemGroup>
     <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
     <PackageVersion Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.14.0" />
-    <PackageVersion Include="coverlet.collector" Version="6.0.2" />
+    <PackageVersion Include="coverlet.collector" Version="6.0.3" />
     <PackageVersion Include="Microsoft.DotNet.BuildTools.GenAPI" Version="3.0.0-preview4-06015-01" />
     <PackageVersion Include="Microsoft.CodeAnalysis" Version="4.11.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />