Restrict Wings listener ALPN to http/1.1 to fix Guzzle broken pipe

envoy-gateway/pelican/wings-client-traffic.yaml

@@ -9,6 +9,10 @@ spec:
       kind: Gateway
       name: gateway-internal
       sectionName: wings
+  tls:
+    # Wings only speaks HTTP/1.1; disabling h2 ALPN prevents Guzzle connection-reuse broken pipe
+    alpnProtocols:
+      - http/1.1
   timeout:
     http:
       requestReceivedTimeout: 0s