test: deflake test-watch-file-shared-dependency

Delay dependency file modification on macOS.

Refs: nodejs#51842

Author: lpinca

test/parallel/test-watch-file-shared-dependency.mjs

@@ -49,6 +49,20 @@ describe('watch file with shared dependency', () => {
     watcher.unfilterFilesOwnedBy([fixturePaths['test.js']]);
     watcher.filterFile(fixturePaths['test.js']);
     watcher.filterFile(fixturePaths['dependency.js'], fixturePaths['test.js']);
-    writeFileSync(fixturePaths['dependency.js'], 'module.exports = { modified: true };');
+
+    if (common.isMacOS) {
+      // Do the write with a delay to ensure that the OS is ready to notify us.
+      setTimeout(() => {
+        writeFileSync(
+          fixturePaths['dependency.js'],
+          'module.exports = { modified: true };'
+        );
+      }, common.platformTimeout(200));
+    } else {
+      writeFileSync(
+        fixturePaths['dependency.js'],
+        'module.exports = { modified: true };'
+      );
+    }
   });
 });