Bump actions/checkout from 3 to 4 in /.github/workflows

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/test_cando.yml

@@ -35,13 +35,13 @@ jobs:
         brew install boost fmt gmp llvm@15 ninja pkg-config sbcl ecl netcdf zeromq
 
     - name: Checkout clasp
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: clasp-developers/clasp
         ref: main
 
     - name: Checkout cando
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         path: extensions/cando