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

Author: renovate[bot]

src/ReactiveMarbles.PropertyChanged.SourceGenerator.Builders/ReactiveMarbles.PropertyChanged.SourceGenerator.Builders.csproj

@@ -13,7 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.11.0" PrivateAssets="all" />
-    <PackageReference Include="ReactiveMarbles.SourceGenerator.TestNuGetHelper" Version="1.2.21" />
+    <PackageReference Include="ReactiveMarbles.SourceGenerator.TestNuGetHelper" Version="1.3.1" />
   </ItemGroup>
 
 </Project>