[co19] Roll co19 to b7660861df12eb489243a591e45f251f8cf8c4a8

2020-09-21 sgrekhov@unipro.ru Spread collections tests fixed to not to fail on tryjobs
2020-09-21 sgrekhov@unipro.ru Load event tests fixed to use absolute path to resource
2020-09-18 sgrekhov@unipro.ru Assertion test fixed to not to fail in a weak mode

Change-Id: I0f0d0f138d207a6ded20bc46100c8bc137a10207
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/163583
Reviewed-by: William Hesse <whesse@google.com>
diff --git a/DEPS b/DEPS
index 8e76008..881deca 100644
--- a/DEPS
+++ b/DEPS
@@ -44,7 +44,7 @@
   # co19 is a cipd package. Use update.sh in tests/co19[_2] to update these
   # hashes. It requires access to the dart-build-access group, which EngProd
   # has.
-  "co19_rev": "827f96b4cddf68cd12049ad5612c53e215b58fcf",
+  "co19_rev": "b7660861df12eb489243a591e45f251f8cf8c4a8",
   "co19_2_rev": "e48b3090826cf40b8037648f19d211e8eab1b4b6",
 
   # The internal benchmarks to use. See go/dart-benchmarks-internal