[bazel/kernel_worker] Only workers use incremental compiler; require digest

Change-Id: Iff4b45ffba79a05ce829ed73d952937ae55624d3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/101282
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Jake Macdonald <jakemac@google.com>

https://dart.googlesource.com/sdk/+/6b730e82039cbb963634a6054bbe9ac50ac7552f
diff --git a/commits.json b/commits.json
index cda6ba5..0012730 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"301f560bd835e462134b491f1d5a74d21d03f3a8",
   "external/github.com/flutter/flutter":"d5aae54a28a2ba04f5737752edba9f5c98259c6c",
-  "sdk":"099af47a69b61274d4f9b8e4c1522733633fe05e"
+  "sdk":"6b730e82039cbb963634a6054bbe9ac50ac7552f"
 }
\ No newline at end of file