Fix CQS signal performance-faster-string-find in xplat/js/react-native-github/packages

Reviewed By: javache

Differential Revision: D78252727

packages/react-native/ReactCommon/jsiexecutor/jsireact/JSIExecutor.cpp

@@ -58,7 +58,7 @@ namespace {
 
 // basename_r isn't in all iOS SDKs, so use this simple version instead.
 std::string simpleBasename(const std::string& path) {
-  size_t pos = path.rfind("/");
+  size_t pos = path.rfind('/');
   return (pos != std::string::npos) ? path.substr(pos) : path;
 }