Bump NUnit from 4.4.0 to 4.5.0

---
updated-dependencies:
- dependency-name: NUnit
  dependency-version: 4.5.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

UnitTests/UnitTests.csproj

@@ -9,7 +9,7 @@
     <NoWarn>NUnit2045</NoWarn>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="nunit" Version="4.4.0" />
+    <PackageReference Include="nunit" Version="4.5.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.1.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.11.2" PrivateAssets="All" />