Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/deploy.yml

@@ -36,7 +36,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            -   uses: actions/checkout@v5
+            -   uses: actions/checkout@v6
                 with:
                     fetch-depth: 0
 
@@ -119,7 +119,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            -   uses: actions/checkout@v5
+            -   uses: actions/checkout@v6
             -   uses: montudor/action-zip@v1
 
             -   name: Setup PHP

.github/workflows/tests.yml

@@ -20,7 +20,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            -   uses: actions/checkout@v5
+            -   uses: actions/checkout@v6
                 with:
                     fetch-depth: 0