Upgrade package:http to 0.12.0.

Change-Id: I621316d2eb1467ee2a403b52013ddbd7844ea02e
Reviewed-on: https://dart-review.googlesource.com/c/81328
Reviewed-by: Zach Anderson <zra@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>
diff --git a/DEPS b/DEPS
index d02659c..3ded0c6 100644
--- a/DEPS
+++ b/DEPS
@@ -89,7 +89,7 @@
   "http_multi_server_tag" : "2.0.5",
   "http_parser_tag" : "3.1.1",
   "http_retry_tag": "0.1.1",
-  "http_tag" : "0.11.3+17",
+  "http_tag" : "0.12.0",
   "http_throttle_tag" : "1.0.2",
   "idl_parser_rev": "5fb1ebf49d235b5a70c9f49047e83b0654031eb7",
   "intl_tag": "0.15.7",
diff --git a/pkg/telemetry/pubspec.yaml b/pkg/telemetry/pubspec.yaml
index dddad2f..ecbef8a 100644
--- a/pkg/telemetry/pubspec.yaml
+++ b/pkg/telemetry/pubspec.yaml
@@ -7,7 +7,7 @@
   sdk: '>=1.0.0 <3.0.0'
 
 dependencies:
-  http: ^0.11.3+12
+  http: ^0.12.0
   path: ^1.4.0
   stack_trace: ^1.7.0
   usage: ^3.2.0+1