Update dependency xUnit.v3 to v3 (#16)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

test/Soenneker.Git.LibGit2Sharp.Tests/Soenneker.Git.LibGit2Sharp.Tests.csproj

@@ -26,7 +26,7 @@
         </PackageReference>
         <PackageReference Include="Soenneker.Utils.Test" Version="3.0.289" />
         <PackageReference Include="Soenneker.Tests.FixturedUnit" Version="3.0.1914" />
-        <PackageReference Include="xUnit.v3" Version="2.0.3" />
+        <PackageReference Include="xUnit.v3" Version="3.0.0" />
     </ItemGroup>
 
     <ItemGroup>