chore: Bump NUnit from 4.4.0 to 4.5.1

---
updated-dependencies:
- dependency-name: NUnit
  dependency-version: 4.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

tests/SVNPathCopy.Tests/SVNPathCopy.Tests.csproj

@@ -10,7 +10,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
-        <PackageReference Include="NUnit" Version="4.4.0" />
+        <PackageReference Include="NUnit" Version="4.5.1" />
         <PackageReference Include="NUnit3TestAdapter" Version="6.2.0" />
         <PackageReference Include="NUnit.Analyzers" Version="4.11.2">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>