Bump OpenTelemetry.Exporter.OpenTelemetryProtocol from 1.12.0 to 1.15.3

---
updated-dependencies:
- dependency-name: OpenTelemetry.Exporter.OpenTelemetryProtocol
  dependency-version: 1.15.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

demo/DemoServer/DemoServer.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="8.0.10" />
 
-    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.12.0" />
+    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.3" />
     <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.12.0" />
     <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.12.0" />
     <PackageReference Include="OpenTelemetry.Instrumentation.SqlClient" Version="1.12.0-beta.3" />