Add "deepseq" to the benchmark's Prelude

benchmark/Main/Prelude.hs

@@ -71,3 +71,7 @@ import Data.Vector as Exports (Vector)
 -- dlist
 -------------------------
 import Data.DList as Exports (DList)
+
+-- deepseq
+-------------------------
+import Control.DeepSeq as Exports (NFData(..), force, deepseq, ($!!))

hasql.cabal

@@ -178,6 +178,7 @@ benchmark benchmark
     hashable,
     dlist,
     -- general:
+    deepseq >= 1 && < 2,
     data-default-class,
     profunctors,
     contravariant,