CI: update actions/checkout to v4

.github/workflows/lint.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v3.2.0
+        uses: actions/checkout@v4
       - name: Lint Code Base
         uses: github/super-linter@v4.1.0
         env:

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
           - centos-stream-8-x64
           # - centos-stream-9-x64 # yum oomkill
     steps:
-      - uses: actions/checkout@v3.2.0
+      - uses: actions/checkout@v4
 
       - name: Setup doctl
         uses: digitalocean/action-doctl@v2