chore(deps): update actions/checkout action to v6

| datasource  | package          | from   | to     |
| ----------- | ---------------- | ------ | ------ |
| github-tags | actions/checkout | v5     | v6     |
| github-tags | actions/checkout | v5.0.1 | v6.0.0 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/php-tests.yml

@@ -18,7 +18,7 @@ jobs:
                     - { php-version: 8.4, dependencies: highest, coverage: pcov, with_coverage: false, allow-fail: true }
         steps:
             -   name: "Checkout"
-                uses: "actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd" # v5.0.1
+                uses: "actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3" # v6.0.0
 
             -   name: "Install PHP"
                 uses: "shivammathur/setup-php@bf6b4fbd49ca58e4608c9c89fba0b8d90bd2a39f" # 2.35.5

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
       - name: Semantic Release
         uses: cycjimmy/semantic-release-action@b12c8f6015dc215fe37bc154d4ad456dd3833c90 # v6.0.0
         with: