Update CI

Below are github's CI complaints:

> The following actions uses node12 which is deprecated and will be forced to
> run on node16: actions/checkout@v2, actions/cache@v1. For more info:
> https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

> As of 2023-09-09, haskell/action/setup is no longer maintained, please switch to
> haskell-actions/setup (note: dash for slash).

.github/workflows/ci.yml

@@ -49,17 +49,17 @@ jobs:
 
     steps:
     # ----------------
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
     # ----------------
-    - uses: haskell/actions/setup@v2
+    - uses: haskell-actions/setup@v2
       id: setup-haskell-cabal
       name: Setup Haskell
       with:
         ghc-version: ${{ matrix.ghc }}
         cabal-version: ${{ matrix.cabal }}
     # ----------------
-    - uses: actions/cache@v1
+    - uses: actions/cache@v3
       name: Cache ~/.cabal/store
       with:
         path: ${{ steps.setup-haskell-cabal.outputs.cabal-store }}