Bump actions/checkout in /.github/workflows

Bumps [actions/checkout](https://github.com/actions/checkout) from c2d88d3ecc89a9ef08eebf45d9637801dcee7eb5 to 8e8c483db84b4bee98b60c0593521ed34d9990e8.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@c2d88d3...8e8c483)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 8e8c483db84b4bee98b60c0593521ed34d9990e8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@c2d88d3ecc89a9ef08eebf45d9637801dcee7eb5" # v6.0.0
+        uses: "actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8" # v6.0.0
         with:
           persist-credentials: false
       - name: "Setup PHP, with composer and extensions"

.github/workflows/security.yml

@@ -18,7 +18,7 @@ jobs:
       actions: read # only needed for private repos
     steps:
       - name: Checkout repository
-        uses: actions/checkout@c2d88d3ecc89a9ef08eebf45d9637801dcee7eb5 # v6.0.0
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.0
         with:
           persist-credentials: false
 

.github/workflows/validate.yml

@@ -19,7 +19,7 @@ jobs:
         php-versions: [ '8.0', '8.1' ]
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@c2d88d3ecc89a9ef08eebf45d9637801dcee7eb5" # v6.0.0
+        uses: "actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8" # v6.0.0
         with:
           persist-credentials: false
       - name: "Setup PHP, with composer and extensions"