Bump NUnit from 4.3.2 to 4.4.0

---
updated-dependencies:
- dependency-name: NUnit
  dependency-version: 4.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Test/Test.csproj

@@ -7,7 +7,7 @@
 
   <ItemGroup>    
     <PackageReference Include="log4net" Version="3.1.0" />
-    <PackageReference Include="nunit" Version="4.3.2" />
+    <PackageReference Include="nunit" Version="4.4.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="5.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageReference Include="SharpPcap" Version="6.3.1" />