src: fix -Winconsistent-missing-override warning

../src/node_http_common.h:497:8: warning: 'MemoryInfo' overrides a
member function but is not marked 'override' [-Winconsistent-missing-override]
  void MemoryInfo(MemoryTracker* tracker) const {

PR-URL: #32126
Refs: #32069
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

Author: cjihrig

src/node_http_common.h

@@ -494,7 +494,7 @@ class NgHeader : public MemoryRetainer {
   inline std::string value() const;
   inline size_t length() const;
 
-  void MemoryInfo(MemoryTracker* tracker) const {
+  void MemoryInfo(MemoryTracker* tracker) const override {
     tracker->TrackField("name", name_);
     tracker->TrackField("value", value_);
   }