Bump the nunit group across 1 directory with 2 updates

Bumps the nunit group with 2 updates in the /src/backend directory: [NUnit](https://github.com/nunit/nunit) and [NUnit.Analyzers](https://github.com/nunit/nunit.analyzers).


Updates `NUnit` from 4.2.2 to 4.3.2
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/main/CHANGES.md)
- [Commits](nunit/nunit@4.2.2...4.3.2)

Updates `NUnit.Analyzers` from 4.4.0 to 4.6.0
- [Release notes](https://github.com/nunit/nunit.analyzers/releases)
- [Changelog](https://github.com/nunit/nunit.analyzers/blob/master/CHANGES.md)
- [Commits](nunit/nunit.analyzers@4.4.0...4.6.0)

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

@@ -11,8 +11,8 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="Moq" Version="4.20.72" />
-    <PackageReference Include="NUnit" Version="4.2.2" />
-    <PackageReference Include="NUnit.Analyzers" Version="4.4.0">
+    <PackageReference Include="NUnit" Version="4.3.2" />
+    <PackageReference Include="NUnit.Analyzers" Version="4.6.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>

tests/backend/WebApi.Tests/packages.lock.json

@@ -40,15 +40,15 @@
       },
       "NUnit": {
         "type": "Direct",
-        "requested": "[4.2.2, )",
-        "resolved": "4.2.2",
-        "contentHash": "mon0OPko28yZ/foVXrhiUvq1LReaGsBdziumyyYGxV/pOE4q92fuYeN+AF+gEU5pCjzykcdBt5l7xobTaiBjsg=="
+        "requested": "[4.3.2, )",
+        "resolved": "4.3.2",
+        "contentHash": "puVXayXNmEu7MFQSUswGmUjOy3M3baprMbkLl5PAutpeDoGTr+jPv33qAYsqxywi2wJCq8l/O3EhHoLulPE1iQ=="
       },
       "NUnit.Analyzers": {
         "type": "Direct",
-        "requested": "[4.4.0, )",
-        "resolved": "4.4.0",
-        "contentHash": "VVl1CuQttXRZh52HRw5SIOut3qXw4pmuiTYk02jTELVWZ9uYRY8IVl2qF9Zs7W0ElPiLDUrAglFBzNLBCPzEcw=="
+        "requested": "[4.6.0, )",
+        "resolved": "4.6.0",
+        "contentHash": "uK1TEViVBugOO6uDou1amu7CoNhrd2sEUFr/iaEmVfoeY8qq/zzWCCUZi97aCCSZmjnHKCCWKh3RucU27qPlKg=="
       },
       "NUnit3TestAdapter": {
         "type": "Direct",