Bump OpenTelemetry.Instrumentation.AspNetCore in /Core

Bumps [OpenTelemetry.Instrumentation.AspNetCore](https://github.com/open-telemetry/opentelemetry-dotnet) from 1.7.0 to 1.8.1.
- [Release notes](https://github.com/open-telemetry/opentelemetry-dotnet/releases)
- [Commits](open-telemetry/opentelemetry-dotnet@core-1.7.0...Instrumentation.Http-1.8.1)

---
updated-dependencies:
- dependency-name: OpenTelemetry.Instrumentation.AspNetCore
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Core/Core.csproj

@@ -14,7 +14,7 @@
         <PackageReference Include="Polly" Version="8.2.1" />
         <PackageReference Include="RestSharp" Version="110.2.0" />
         <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.7.0" />
-        <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.7.0" />
+        <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.8.1" />
         <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.7.0" />
         <PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.7.0" />
         <PackageReference Include="Scrutor" Version="4.2.2" />