Bump some GitHub Actions versions to prevent Dependabot from opening pull
requests every time we regenerate the haskell-ci workflow.

--- .github/workflows/haskell-ci.yml.orig
+++ .github/workflows/haskell-ci.yml
@@ -190,7 +190,7 @@ jobs:
           chmod a+x $HOME/.cabal/bin/cabal-plan
           cabal-plan --version
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           path: source
       - name: autoreconf
@@ -231,7 +231,7 @@ jobs:
           $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH --dry-run all
           cabal-plan
       - name: cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}
           path: ~/.cabal/store