Fix: Add false positive cppcheck-suppress for compatibility with updated cppcheck version

- Added a cppcheck-suppress directive to handle a false positive detected
  by cppcheck 2.16.
- This change addresses an issue caused by the recent Homebrew update
  on macOS CI runner, which upgraded cppcheck from version 2.15 to 2.16.

src/utils/system.cc

@@ -210,7 +210,7 @@ bool isFile(const std::string& f) {
         return false;
     }
     fstat(fileno(fp), &fileInfo);
-    if (!S_ISREG(fileInfo.st_mode)) {
+    if (!S_ISREG(fileInfo.st_mode)) { // cppcheck-suppress syntaxError ; false positive
         fclose(fp);
         return false;
     }