chore: Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -41,7 +41,7 @@ jobs:
     name: "Code Quality"
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Set up PHP
         uses: shivammathur/setup-php@bf6b4fbd49ca58e4608c9c89fba0b8d90bd2a39f # v2

.github/workflows/integration-tests.yml

@@ -79,7 +79,7 @@ jobs:
           -e POSTGRES_INITDB_ARGS="--data-checksums"
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Set up PHP
         uses: shivammathur/setup-php@bf6b4fbd49ca58e4608c9c89fba0b8d90bd2a39f # v2

.github/workflows/unit-tests.yml

@@ -61,7 +61,7 @@ jobs:
             doctrine-lexer: '2.1'
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Set up PHP with PECL extension
         uses: shivammathur/setup-php@bf6b4fbd49ca58e4608c9c89fba0b8d90bd2a39f # v2