Bump NUnit in /eFormAPI/Plugins/BackendConfiguration.Pn

Bumps [NUnit](https://github.com/nunit/nunit) from 3.14.0 to 4.3.1.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/main/CHANGES.md)
- [Commits](nunit/nunit@v3.14.0...4.3.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

eFormAPI/Plugins/BackendConfiguration.Pn/BackendConfiguration.Pn.Integration.Test/BackendConfiguration.Pn.Integration.Test.csproj

@@ -12,7 +12,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
         <PackageReference Include="NSubstitute" Version="5.1.0" />
-        <PackageReference Include="NUnit" Version="3.14.0" />
+        <PackageReference Include="NUnit" Version="4.3.1" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
         <PackageReference Include="NUnit.Analyzers" Version="3.10.0">
           <PrivateAssets>all</PrivateAssets>

eFormAPI/Plugins/BackendConfiguration.Pn/BackendConfiguration.Pn.Test/BackendConfiguration.Pn.Test.csproj

@@ -10,7 +10,7 @@
     <ItemGroup>
       <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
       <PackageReference Include="NSubstitute" Version="5.1.0" />
-      <PackageReference Include="NUnit" Version="3.14.0" />
+      <PackageReference Include="NUnit" Version="4.3.1" />
       <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
       <PackageReference Include="Testcontainers" Version="4.0.0" />
       <PackageReference Include="Testcontainers.MariaDb" Version="4.0.0" />