CI: use latest versions of third-party actions

Author: tarleb

.github/workflows/ci.yml

@@ -33,15 +33,15 @@ jobs:
             cabal: '3.8'
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
-    - uses: haskell/actions/setup@v1
+    - uses: haskell/actions/setup@v2
       name: Setup Haskell
       with:
         ghc-version: ${{ matrix.versions.ghc }}
         cabal-version: ${{ matrix.versions.cabal }}
 
-    - uses: actions/cache@v1
+    - uses: actions/cache@v3
       name: Cache ~/.cabal/store
       with:
         path: ~/.cabal/store