Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/haskell.yml

@@ -30,7 +30,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: haskell-actions/setup@v2
         id: setup-haskell-cabal
         with: