chore(deps): update dependency reactivemarbles.sourcegenerator.testnugethelper to v1.3.1 (#109)

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

Author: renovate[bot]

Diff for: src/directory.packages.props

@@ -34,7 +34,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageVersion Include="Verify.SourceGenerators" Version="1.2.0" />
     <PackageVersion Include="Verify.Xunit" Version="14.13.1" />
-    <PackageVersion Include="ReactiveMarbles.SourceGenerator.TestNuGetHelper" Version="1.2.1" />
+    <PackageVersion Include="ReactiveMarbles.SourceGenerator.TestNuGetHelper" Version="1.3.1" />
   </ItemGroup>
 
   <Import