Try bumping checkout

Author: thomasjm

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: self-hosted
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: verify-default-nix.sh
       if: "!contains(github.event.head_commit.message, 'noci')"
@@ -42,7 +42,7 @@ jobs:
         - spellchecker
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: recursive