Add package tables to the configuration file

lib/SlackBuilder/LatestVersionCheck.hs

@@ -38,7 +38,7 @@ import Network.HTTP.Req
     , useHttpsURI
     , bsResponse
     , POST(..)
-    , ReqBodyJson(..)
+    , ReqBodyJson(..), JsonResponse
     )
 import Text.URI (mkURI)
 import SlackBuilder.Trans
@@ -181,7 +181,8 @@ latestPackagist PackageOwner{..} = do
                 /: owner
                 /: name <> ".json"
          in req GET uri NoReqBody jsonResponse mempty
-    let packagistPackages = packages $ responseBody packagistResponse
+    let packagistPackages = getField @"packages"
+            $ responseBody (packagistResponse :: JsonResponse PackagistResponse)
         fullName = Text.intercalate "/" [owner, name]
 
     pure $ HashMap.lookup fullName packagistPackages