WPB-9102 gundeck: Better tolerance for redis-cluster restarts (#4084)

* hedis: Upgrade to fix connection timeout issues with cluster

Upstream PR: informatikr/hedis#227

* changelog

Author: battermann

changelog.d/3-bug-fixes/redis

@@ -0,0 +1 @@
+gundeck: Better tolerance for redis-cluster restarts

nix/haskell-pins.nix

@@ -130,11 +130,12 @@ let
 
     # PR: https://github.com/informatikr/hedis/pull/224
     # PR: https://github.com/informatikr/hedis/pull/226
+    # PR: https://github.com/informatikr/hedis/pull/227
     hedis = {
       src = fetchgit {
         url = "https://github.com/wireapp/hedis";
-        rev = "c45975e4b5f42b9d0c853e2d59ed55582f6b1482";
-        sha256 = "sha256-oB7Z7ErYFguLiWPaFzCsD3Q+7UPfAkvdkc8aKSePmbQ=";
+        rev = "87f4a5ecfa572dfdc9ebe905485d0012ad2d1833";
+        sha256 = "sha256-3evlUj/n39SYncJDUjN6hk12tn/DyCFy2TFvP0/6xdU=";
       };
     };