Re-enable mangopay packages.

Build issues should be fixed by versions 0.12 of both packages.

build-constraints.yaml

@@ -403,8 +403,7 @@ packages:
         - esqueleto
         - fb
         - fb-persistent
-        # aeson < 0.10
-        # - mangopay
+        - mangopay
         - nonce
         - serversession
         - serversession-backend-acid-state
@@ -417,8 +416,7 @@ packages:
         - yesod-auth-account-fork
         - yesod-auth-fb
         - yesod-fb
-        # http-types < 0.9
-        # - yesod-mangopay
+        - yesod-mangopay
 
     "Alexander Altman <alexanderaltman@me.com>":
         - base-unicode-symbols