Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
         ghc: ['8.6', '8.8', '8.10', '9.0', '9.2']
       fail-fast: false
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/[email protected]
       name: Cache ~/.cabal/packages
       with:
@@ -51,7 +51,7 @@ jobs:
         stack-yaml: ['stack-8.10.yaml']
       fail-fast: false
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/[email protected]
       name: Cache ~/.stack
       with:
@@ -79,7 +79,7 @@ jobs:
         stack-yaml: ['stack-8.10.yaml']
       fail-fast: false
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/[email protected]
       name: Cache ~/.stack
       with:
@@ -107,7 +107,7 @@ jobs:
         ghc: ['8.10', '9.0', '9.2']
       fail-fast: false
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/[email protected]
       name: Cache ~/.cabal/packages
       with: