maint(deps): bump go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux from 0.51.0 to 0.53.0 in /examples/webhook-listener-triggers

maint(deps): bump go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux from 0.51.0 to 0.53.0 in /examples/webhook-listener-triggers #242