ci: update github action

Author: grzuy

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
               otp: 26.2
             lint: lint
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: erlef/setup-beam@v1
         with: