Fix code coverage

Author: JimBobSquarePants

msbuild/props/SixLabors.Global.props

@@ -32,7 +32,6 @@
       https://api.nuget.org/v3/index.json;
       https://www.myget.org/F/sixlabors/api/v3/index.json;
       https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json;
-      https://f.feedz.io/marcorossignoli/coverletunofficial/nuget/index.json;
     </RestoreSources>
   </PropertyGroup>
 

msbuild/props/SixLabors.Tests.props

@@ -19,7 +19,7 @@
     <PackageReference Include="xunit" Version="2.4.1" IsImplicitlyDefined="true" />
 
     <PackageReference Include="coverlet.collector"
-                      Version="3.0.0-preview.9"
+                      Version="3.0.2"
                       PrivateAssets="All"
                       IsImplicitlyDefined="true"
                       Condition="'$(codecov)' == 'true'"/>