Bump NUnit.Analyzers in /src/backend in the nunit group

Bumps the nunit group in /src/backend with 1 update: [NUnit.Analyzers](https://github.com/nunit/nunit.analyzers).


Updates `NUnit.Analyzers` from 4.3.0 to 4.4.0
- [Release notes](https://github.com/nunit/nunit.analyzers/releases)
- [Changelog](https://github.com/nunit/nunit.analyzers/blob/master/CHANGES.md)
- [Commits](nunit/nunit.analyzers@4.3.0...4.4.0)

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

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

tests/backend/WebApi.Tests/WebApi.Tests.csproj

@@ -12,7 +12,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="Moq" Version="4.20.72" />
     <PackageReference Include="NUnit" Version="4.2.2" />
-    <PackageReference Include="NUnit.Analyzers" Version="4.3.0">
+    <PackageReference Include="NUnit.Analyzers" Version="4.4.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>