Bump to actions/checkout@v4

actions/checkout@v3 uses nodejs 16 that is deprecated

Author: stronk7

.github/workflows/ci.yml

@@ -88,7 +88,7 @@ jobs:
             database: pgsql
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: plugin