Update Directory.Packages.props

Author: SimonCropp

src/Directory.Packages.props

@@ -17,7 +17,7 @@
     <PackageVersion Include="ProjectDefaults" Version="1.0.174" />
     <PackageVersion Include="Verify" Version="31.20.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.2.0" />
-    <PackageVersion Include="Verify.NUnit" Version="31.19.1" />
+    <PackageVersion Include="Verify.NUnit" Version="31.20.0" />
     <PackageVersion Include="Verify.OpenXML" Version="1.18.1" />
     <PackageVersion Include="Argon" Version="0.34.0" />
     <PackageVersion Include="DiffEngine" Version="19.2.0" />