Upgrade containers submodule

Reviewers: bgamari

Subscribers: rwbarton, thomie, carter

Differential Revision: https://phabricator.haskell.org/D4340

containers @ a57e7dd0

-Subproject commit c07e4848e1b4458265e30cfb6265f9b6bd2bf053
+Subproject commit a57e7dd0c0aa6a719a73085ae30edef8206ccea0

testsuite/tests/backpack/should_run/bkprun05.stderr

 bkprun05: Prelude.undefined
 CallStack (from HasCallStack):
   error, called at libraries/base/GHC/Err.hs:79:14 in base:GHC.Err
-  undefined, called at bkprun05.bkp:138:30 in app+app-89WS9ScvjQd9lPG2oW0wWM:App
+  undefined, called at bkprun05.bkp:138:30 in app+app-0UPCJKIsbig160BXB4AqAb:App

testsuite/tests/driver/T10970.stdout

-0.5.10.2
+0.5.11.0
 OK

testsuite/tests/package/package01e.stderr

 
 package01e.hs:2:1: error:
     Could not find module ‘Data.Map’
-    It is a member of the hidden package ‘containers-0.5.10.2’.
+    It is a member of the hidden package ‘containers-0.5.11.0’.
     Use -v to see a list of the files searched for.
 
 package01e.hs:3:1: error:
     Could not find module ‘Data.IntMap’
-    It is a member of the hidden package ‘containers-0.5.10.2’.
+    It is a member of the hidden package ‘containers-0.5.11.0’.
     Use -v to see a list of the files searched for.