Update actions/checkout

Author: kazk

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.repository == 'codewars/forth' }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: docker/setup-buildx-action@v2
 
       - name: Build image

.github/workflows/push-image.yml

@@ -15,7 +15,7 @@ jobs:
       contents: read
       packages: write
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2