Fix up to follow Hackage rules

ndmitchell · ndmitchell · commit ee364a4bbe6f · 2024-01-14T11:31:36.000Z
diff --git a/hoogle.cabal b/hoogle.cabal
@@ -1,4 +1,4 @@
-cabal-version:      >= 1.18
+cabal-version:      1.18
 build-type:         Simple
 name:               hoogle
 version:            5.0.18.4
