chore(deps): update dependency richardszalay.mockhttp to v7

Author: renovate[bot]

Refit.Tests/Refit.Tests.csproj

@@ -8,7 +8,7 @@
     <!-- Some tests rely on CallerFilePath -->
     <RestoreAdditionalProjectSources>https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json</RestoreAdditionalProjectSources>
     <NoWarn>$(NoWarn);CS1591;CA1819;CA2000;CA2007;CA1056;CA1707;CA1861;xUnit1031</NoWarn>
-    <MockHttpVersion>6.0.0</MockHttpVersion>
+    <MockHttpVersion>7.0.0</MockHttpVersion>
     <IsPackable>false</IsPackable>
   </PropertyGroup>