Update to the latest package:async

Change-Id: I368aea9d01541212fe359a6d91daa945ad9a370e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/197446
Auto-Submit: Nate Bosch <nbosch@google.com>
Commit-Queue: Gary Roumanis <grouma@google.com>
Reviewed-by: Gary Roumanis <grouma@google.com>

Author: natebosch

.dart_tool/package_config.json

@@ -11,7 +11,7 @@
     "constraint, update this by running tools/generate_package_config.dart."
   ],
   "configVersion": 2,
-  "generated": "2021-04-29T10:51:01.320402",
+  "generated": "2021-04-29T17:48:25.665083",
   "generator": "tools/generate_package_config.dart",
   "packages": [
     {

DEPS

@@ -73,7 +73,7 @@ vars = {
 
   # Revisions of /third_party/* dependencies.
   "args_rev": "d8fea36c10ef96797be02e3d132d572445cd86f4",
-  "async_rev": "06774f59a7cf9780e08148298d438c1043e2b063",
+  "async_rev": "cde00b89bd3c19e877b21de2c02282d4d311d0a5",
   "bazel_worker_rev": "0885637b037979afbf5bcd05fd748b309fd669c0",
   "benchmark_harness_rev": "c546dbd9f639f75cd2f75de8df2eb9f8ea15e8e7",
   "boolean_selector_rev": "665e6921ab246569420376f827bff4585dff0b14",