Roll Fuchsia Mac SDK from Id94G... to xRJHj... (#18646)

https://dart.googlesource.com/external/github.com/flutter/engine/+/0e402dde6da1cac606ab3728e0525218a83700ef
diff --git a/commits.json b/commits.json
index 4a84aca..adc4fea 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
-  "external/github.com/flutter/engine":"22692a6d931c567c941f7303d06736391c70a19c",
+  "external/github.com/flutter/engine":"0e402dde6da1cac606ab3728e0525218a83700ef",
   "external/github.com/flutter/flutter":"a1636b6fef2ebe7840ba6dc1b3f9d77095ef3b45",
   "sdk":"4f3293c70eefd0f4d4611f885236918649b31a78"
 }
\ No newline at end of file