[infra] Update checked in SDKs to 2.3.0

TBR=whesse@google.com

Change-Id: I36be14e0bd44420583354f23c974d8c16c964f4a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/101984
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>
diff --git a/DEPS b/DEPS
index 208ee7a..8d47243 100644
--- a/DEPS
+++ b/DEPS
@@ -157,7 +157,7 @@
   Var("dart_root") + "/tools/sdks": {
       "packages": [{
           "package": "dart/dart-sdk/${{platform}}",
-          "version": "version:2.2.1-dev.3.1",
+          "version": "version:2.3.0",
       }],
       "dep_type": "cipd",
   },