nuget update

tests/SharpGLTF.Tests/SharpGLTF.Tests.csproj

@@ -13,7 +13,7 @@
   <ItemGroup>
     <PackageReference Include="LibGit2Sharp" Version="0.26.0" />
     <PackageReference Include="nunit" Version="3.12.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="3.13.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="3.14.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
     <PackageReference Include="PLplot" Version="5.13.7" />    
   </ItemGroup>