Upgrade prometheus to opentelemetry-cpp 1.19.0

Author: marcalff

.github/workflows/prometheus.yml

@@ -65,7 +65,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: "open-telemetry/opentelemetry-cpp"
-          ref: "v1.15.0"
+          ref: "v1.19.0"
           path: "otel_cpp"
           submodules: "recursive"
       - name: run tests
@@ -103,7 +103,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: "open-telemetry/opentelemetry-cpp"
-          ref: "v1.15.0"
+          ref: "v1.19.0"
           path: "otel_cpp"
           submodules: "recursive"
       - name: setup