Bump actions/checkout to v4

Author: Frederick888

.github/workflows/gh-ph.yml

@@ -12,7 +12,7 @@ jobs:
     name: Add commit history to pull request description
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: Frederick888/gh-ph@v1

.github/workflows/php.yml

@@ -25,7 +25,7 @@ jobs:
         php-version: ["8.2", "8.1", "8.0", "7.4", "7.3"]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Cancel Previous Runs
         if: contains(matrix.os, 'ubuntu') && contains(matrix.php-version, '8.2')