chore: use xunit.v3.extensibility.core instead of xunit.v3.core (#226)

Co-authored-by: Gabriel Lucaci <gabriel.lucaci.dev@gmail.com>

Author: vhatsura

src/Snapshooter.Xunit3/Snapshooter.Xunit3.csproj

@@ -13,8 +13,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="xunit.v3.core" Version="1.0.1" />
-    <PackageReference Include="xunit.v3.assert" Version="1.0.1" />
+    <PackageReference Include="xunit.v3.extensibility.core" Version="3.2.0" />
+    <PackageReference Include="xunit.v3.assert" Version="3.2.0" />
   </ItemGroup>
 
   <ItemGroup>