chore: Update OpenTelemetry packages in Core to 1.15.3. (#3544)

Author: jaffinito

src/Agent/NewRelic/Agent/Core/Core.csproj

@@ -60,8 +60,8 @@
     only have a .NET Standard target -->
     <PackageReference Include="SharpZipLib" Version="1.3.3" />
     <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="10.0.6" />
-    <PackageReference Include="OpenTelemetry" Version="1.15.2" />
-    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.2" />
+    <PackageReference Include="OpenTelemetry" Version="1.15.3" />
+    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.3" />
   </ItemGroup>
 
   <ItemGroup>