chore(gha): Update actions/checkout to v5 (#217)

Author: lyrixx

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Checkout
-              uses: actions/checkout@v4
+              uses: actions/checkout@v5
 
             - name: PHP-CS-Fixer
               uses: docker://oskarstark/php-cs-fixer-ga
@@ -25,7 +25,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: "Checkout"
-              uses: actions/checkout@v4
+              uses: actions/checkout@v5
 
             - name: Setup PHP, with composer and extensions
               uses: shivammathur/setup-php@v2
@@ -92,7 +92,7 @@ jobs:
                       elastica-version: "9.*"
         steps:
             - name: Checkout
-              uses: actions/checkout@v4
+              uses: actions/checkout@v5
 
             - name: Setup PHP, with composer and extensions
               uses: shivammathur/setup-php@v2