tests: integration: prevent port binding failures in concurrent OTEL tests (#11808)

Signed-off-by: Patrick Stephens <pat@telemetryforge.io>

Author: patrick-stephens

tests/runtime/data/routing/otlp_comprehensive_routing_test.yaml

@@ -1,7 +1,7 @@
 pipeline:
   inputs:
     - name: opentelemetry
-      port: 4318
+      port: 4319
       routes:
         logs:
           # Route 1: Match by resource attribute - service_name

tests/runtime/in_opentelemetry_routing.c

@@ -38,7 +38,9 @@
 #include "../../plugins/in_opentelemetry/opentelemetry_logs.h"
 
 #define JSON_CONTENT_TYPE "application/json"
-#define PORT_OTEL 4318
+/* Pick a port that is not in use by other tests as well */
+/* Ensure you update data/routing/otlp_comprehensive_routing_test.yaml */
+#define PORT_OTEL 4319
 #define V1_ENDPOINT_LOGS "/v1/logs"
 #define MAX_ROUTES 32