Remove if on actions/checkout (makes no sense)

Author: andreasabel

.github/workflows/ci.yml

@@ -37,7 +37,6 @@ jobs:
         ghc: [9.6.7, 9.8.4, 9.10.3, 9.12.2]
     steps:
     - uses: actions/checkout@v6
-      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
 
     # Takes care of ghc and cabal. See https://github.com/haskell/actions.
     - uses: haskell-actions/setup@v2