[infra] Roll clang_format_scripts to a version supporting python3

Change-Id: I3f3f1d3c6b100060051799be99208e9dec6ed1c5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/235621
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: William Hesse <whesse@google.com>
diff --git a/DEPS b/DEPS
index dc14ff7..ea1fd32 100644
--- a/DEPS
+++ b/DEPS
@@ -71,7 +71,7 @@
   "gn_revision": "b79031308cc878488202beb99883ec1f2efd9a6d",
 
   # Scripts that make 'git cl format' work.
-  "clang_format_scripts_rev": "c09c8deeac31f05bd801995c475e7c8070f9ecda",
+  "clang_format_scripts_rev": "bb994c6f067340c1135eb43eed84f4b33cfa7397",
 
   "gperftools_revision": "180bfa10d7cb38e8b3784d60943d50e8fcef0dcb",