Update EF dependencies to stop using preview

Author: JonathanMagnan

GraphDiff/GraphDiff.NetStandard21/GraphDiff.NetStandard21.csproj

@@ -14,7 +14,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="EntityFramework" Version="6.3.0-preview7-19363-02" />
+    <PackageReference Include="EntityFramework" Version="6.3.0" />
   </ItemGroup>
 
   <Import Project="..\GraphDiff.Shared\GraphDiff.Shared.projitems" Label="Shared" />

GraphDiff/GraphDiff.Tests.NetStandard21/GraphDiff.Tests.NetStandard21.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="EntityFramework" Version="6.3.0-preview7-19363-02" />
+    <PackageReference Include="EntityFramework" Version="6.3.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
     <PackageReference Include="MSTest.TestAdapter" Version="1.4.0" />
     <PackageReference Include="MSTest.TestFramework" Version="1.4.0" />