ci: fix doc build under ghc 8.4.4

Author: ali-abrar

.github/workflows/haskell.yml

@@ -38,5 +38,7 @@ jobs:
     - name: Run tests
       # We don't run hlint tests, because different versions of hlint have different suggestions, and we don't want to worry about satisfying them all.
       run: cabal test --enable-tests -f-hlint all
-    - name: Build Docs
+    - if: matrix.ghc != '8.4.4'
+      # docs aren't built on ghc 8.4.4 because some dependency docs don't build on older GHCs
+      name: Build Docs
       run: cabal haddock

patch.cabal

@@ -49,7 +49,7 @@ library
                , transformers >= 0.5.6.0 && < 0.7
                , witherable >= 0.3 && < 0.5
 
-  if impl(ghc < 8.6) -- really, if base < 8.12
+  if impl(ghc < 8.6)
     build-depends: base-orphans >= 0.8 && < 0.9
 
   exposed-modules: Data.Functor.Misc