deps: Update dependency NuGet.Packaging to version 6.4.3 [SECURITY]

Updates-dependency: NuGet.Packaging
Updates-dependency-from-version: 6.4.0
Updates-dependency-to-version: 6.4.3

Author: renovate[bot]

src/Utilities.Test/Grynwald.Utilities.Test.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="Mono.Cecil" Version="0.11.4" />
     <PackageReference Include="NuGet.Frameworks" Version="6.4.0" />
-    <PackageReference Include="NuGet.Packaging" Version="6.4.0" />
+    <PackageReference Include="NuGet.Packaging" Version="6.4.3" />
     <PackageReference Include="xunit" Version="2.4.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" PrivateAssets="all" />
   </ItemGroup>