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] <support@github.com>

.github/workflows/codespell.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout url-scgi
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           persist-credentials: false
 

.github/workflows/test.yml

@@ -21,28 +21,28 @@ jobs:
 
     steps:
     - name: Checkout async
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: jwiegley/emacs-async
         path: async
         persist-credentials: false
 
     - name: Checkout url-scgi
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: skangas/url-scgi
         path: url-scgi
         persist-credentials: false
 
     - name: Checkout xml-rpc
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: xml-rpc-el/xml-rpc-el
         path: xml-rpc
         persist-credentials: false
 
     - name: Checkout mentor
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: skangas/mentor
         path: mentor