Bump haskell/actions from 1 to 1.2.1

Bumps [haskell/actions](https://github.com/haskell/actions) from 1 to 1.2.1.
- [Release notes](https://github.com/haskell/actions/releases)
- [Commits](haskell/actions@v1...v1.2.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         ghc: ['9.0', '8.10', '8.8', '8.6', '8.4', '8.2']
     steps:
     - uses: actions/checkout@v2
-    - uses: haskell/actions/setup@v1
+    - uses: haskell/actions/setup@v1.2.1
       id: setup-haskell-cabal
       with:
         ghc-version: ${{ matrix.ghc }}