Fixing memory leak in EditableTextState (#131377)

https://dart.googlesource.com/external/github.com/flutter/flutter/+/4b89fce108ac6350b4e73a436f98ba3c3b7d6a74

DEPS

diff --git a/DEPS b/DEPS
index 970c6be..64e1195 100644
--- a/DEPS
+++ b/DEPS
@@ -264,7 +264,7 @@
 
   'engine/src/third_party/dart': Var('dart_git') + '/sdk' + '@' + 'feda2f41ca6bcbc3b113e505b7a89cb6ea376810',
 
-  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + 'd1410a11b6f071bce5b0d02807488e5141f6895b',
+  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '4b89fce108ac6350b4e73a436f98ba3c3b7d6a74',
 
    # Fuchsia compatibility
    #

commits.json

diff --git a/commits.json b/commits.json
index 59b774b..4538dd1 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "engine/src/flutter":"b63eee2e31cc3739bf89d193fde6fa6f66fba04a",
   "engine/src/third_party/dart":"feda2f41ca6bcbc3b113e505b7a89cb6ea376810",
-  "flutter":"d1410a11b6f071bce5b0d02807488e5141f6895b"
+  "flutter":"4b89fce108ac6350b4e73a436f98ba3c3b7d6a74"
 }
\ No newline at end of file