chore(deps): update dependency system.net.http.winhttphandler to v7 (#54)

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

Author: renovate[bot]

src/OpenFeature.Contrib.Providers.Flagd/OpenFeature.Contrib.Providers.Flagd.csproj

@@ -19,7 +19,7 @@
     </AssemblyAttribute>
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net462'">
-    <PackageReference Include="System.Net.Http.WinHttpHandler" Version="6.0.1" />
+    <PackageReference Include="System.Net.Http.WinHttpHandler" Version="7.0.0" />
   </ItemGroup>
   <ItemGroup>
     <!-- The schema.proto file referenced here will be used to automatically generate the Grpc client when executing 'dotnet build' -->