[dartfmt] Bump dart_style to 1.2.4

TBR=whesse@google.com

Closes: https://github.com/dart-lang/sdk/issues/36190
Change-Id: If89601251c335e141d0cb5a2e592535c5b7ccec3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96949
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>
diff --git a/DEPS b/DEPS
index 88c3561..f1860721 100644
--- a/DEPS
+++ b/DEPS
@@ -79,7 +79,7 @@
   #     minutes later.
   #
   # For more details, see https://github.com/dart-lang/sdk/issues/30164
-  "dart_style_tag": "1.2.2",  # Please see the note above before updating.
+  "dart_style_tag": "1.2.4",  # Please see the note above before updating.
 
   "dartdoc_tag" : "v0.28.2",
   "fixnum_tag": "0.10.9",