Upgrade checkout step to v6 (#67)

Author: uveta

.github/workflows/api.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
           lfs: true

.github/workflows/app.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
           lfs: true

.github/workflows/infra.yml

@@ -16,7 +16,7 @@ jobs:
     environment: Development
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
           lfs: false