use version 2 for action checkout

Author: corsicanec82

.github/workflows/hexlet-check.yml

@@ -19,7 +19,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2
 
       - name: Hexlet project check
         uses: hexlet/project-action@release