update checkout to v4

Author: salehhashemi1992

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Validate composer.json and composer.lock
         run: composer validate

.github/workflows/code-style.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/directory_workflow.yml

@@ -8,7 +8,7 @@ jobs:
     name: DIRECTORY.md
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1 # v2 is broken for git diff
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v2
       - name: Setup Git Specs
         run: |