Bump OpenTelemetry.Instrumentation.Http in /test/IntegrationTests

Bumps [OpenTelemetry.Instrumentation.Http](https://github.com/open-telemetry/opentelemetry-dotnet) from 1.0.0-rc9.4 to 1.0.0-rc9.6.
- [Release notes](https://github.com/open-telemetry/opentelemetry-dotnet/releases)
- [Commits](open-telemetry/opentelemetry-dotnet@1.0.0-rc9.4...1.0.0-rc9.6)

---
updated-dependencies:
- dependency-name: OpenTelemetry.Instrumentation.Http
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

src/OpenTelemetry.AutoInstrumentation/OpenTelemetry.AutoInstrumentation.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="OpenTelemetry.Exporter.Prometheus" Version="1.3.0-rc.2" />
     <PackageReference Include="OpenTelemetry.Exporter.Zipkin" Version="1.3.0" />
     <PackageReference Include="OpenTelemetry.Instrumentation.GrpcNetClient" Version="1.0.0-rc9.4" />
-    <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.0.0-rc9.4" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.0.0-rc9.6" />
     <PackageReference Include="OpenTelemetry.Instrumentation.Runtime" Version="1.0.0" />
     <PackageReference Include="OpenTelemetry.Instrumentation.SqlClient" Version="1.0.0-rc9.4" />
     <PackageReference Include="OpenTelemetry.Shims.OpenTracing" Version="1.0.0-rc9.4" />