Roll Fuchsia Mac SDK from 5yPfm... to Id94G... (#18630)

https://dart.googlesource.com/external/github.com/flutter/engine/+/368fe27d23dc34b93ae38414c5d6a508851829c6
diff --git a/commits.json b/commits.json
index 7fd04f1..9ac3965 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
-  "external/github.com/flutter/engine":"86f5130ac3ac0484f816ff8c78812db053029957",
+  "external/github.com/flutter/engine":"368fe27d23dc34b93ae38414c5d6a508851829c6",
   "external/github.com/flutter/flutter":"5663e02645a6e69fedfe8553cbe7940cbb592be9",
   "sdk":"7a63d5889cb413584188f9a73eb88778d81d0ab3"
 }
\ No newline at end of file