Update checked-in SDKs to 3.7.0-224.0.dev

Fixes: #59694
Change-Id: Ie414283285ed5d3efe7017be8ba73d301061c3b5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/399920
Commit-Queue: Alexander Thomas <[email protected]>
Reviewed-by: Sigurd Meldgaard <[email protected]>

Author: athomas

DEPS

@@ -50,7 +50,7 @@ vars = {
   # Checked-in SDK version. The checked-in SDK is a Dart SDK distribution
   # in a cipd package used to run Dart scripts in the build and test
   # infrastructure, which is automatically built on the release commits.
-  "sdk_tag": "git_revision:7fce3544047c41018b8c00b4453c0262f463dd74",
+  "sdk_tag": "git_revision:c7e47c6c5df6ffa16d92704d5291b3387f974648",
 
   # co19 is a cipd package automatically generated for each co19 commit.
   # Use tests/co19/update.sh to update this hash.