Bump OpenTelemetry.Exporter.OpenTelemetryProtocol from 1.9.0 to 1.15.3 (#139)

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

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Author: dependabot[bot]

src/OpenTelemetry/CoreSdkForwarding/TemporalioSamples.OpenTelemetry.CoreSdkForwarding.csproj

@@ -9,7 +9,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.9.0" />
+    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.3" />
   </ItemGroup>
 
 </Project>