Bump NUnit from 4.0.1 to 4.1.0 in /src

Bumps NUnit from 4.0.1 to 4.1.0.

---
updated-dependencies:
- dependency-name: NUnit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Orc.Snapshots.Tests/Orc.Snapshots.Tests.csproj

@@ -21,7 +21,7 @@
     </PackageReference>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="ModuleInit.Fody" Version="2.1.1" PrivateAssets="all" />
-    <PackageReference Include="NUnit" Version="4.0.1" PrivateAssets="all" />
+    <PackageReference Include="NUnit" Version="4.1.0" PrivateAssets="all" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" PrivateAssets="all" />
     <PackageReference Include="Orc.Automation.Tests" Version="5.0.0" />
     <PackageReference Include="Orc.Theming" Version="5.0.0" />