Bump NUnit from 4.3.2 to 4.4.0 (#130)

Updated [NUnit](https://github.com/nunit/nunit) from 4.3.2 to 4.4.0.

<details>
<summary>Release notes</summary>

_Sourced from [NUnit's
releases](https://github.com/nunit/nunit/releases)._

## 4.4.0

See [release
notes](https://docs.nunit.org/articles/nunit/release-notes/framework.html#nunit-440---aug-6-2025)
for details.

Commits viewable in [compare
view](nunit/nunit@4.3.2...4.4.0).
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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matt LaPaglia <mlapaglia@gmail.com>

Author: dependabot[bot]

Tests/Tests.csproj

@@ -26,7 +26,7 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="9.0.8" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
-    <PackageReference Include="NUnit" Version="4.3.2" />
+    <PackageReference Include="NUnit" Version="4.4.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.10.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>