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]>

.github/workflows/ci.wasm32.yml

@@ -20,7 +20,7 @@ jobs:
           popd
 
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: build
         run: |

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
         os: [ubuntu-latest, macOS-latest]
         ghc: ['9.4.4', '9.2.5', '9.0.2']
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: haskell/actions/setup@v2
       id: setup-haskell-cabal
       with:
@@ -44,7 +44,7 @@ jobs:
       matrix:
         ghc: ['9.4.4', '9.2.5', '9.0.2']
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: haskell/actions/setup@v2
       id: setup-haskell-cabal
       with:
@@ -76,7 +76,7 @@ jobs:
     # See https://github.com/marketplace/actions/freebsd-vm.
     runs-on: macos-12
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Build
       id: build-freebsd
       uses: vmactions/freebsd-vm@v0