Bump Microsoft.NET.Test.Sdk from 17.12.0 to 17.13.0 (#109)

Author: dependabot[bot]

RegexToolbox.Tests/RegexToolbox.Tests.csproj

@@ -11,7 +11,7 @@
     <ItemGroup>
         <PackageReference Include="NUnit" Version="4.3.2" />
         <PackageReference Include="NUnit3TestAdapter" Version="5.0.0" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     </ItemGroup>
 
     <ItemGroup>