Adjust the size of //deps/rabbit:bindings_SUITE to medium

generally speaking, rabbitmq_integration_suite tests do not reliably
run in under the 60s timeout implied by "small", at least in CI

Author: HoloRin

deps/rabbit/BUILD.bazel

@@ -1105,7 +1105,7 @@ rabbitmq_integration_suite(
 
 rabbitmq_integration_suite(
     name = "bindings_SUITE",
-    size = "small",
+    size = "medium",
 )
 
 rabbitmq_integration_suite(