Bump actions/checkout from 3 to 4 in /.github/workflows

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

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

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: |

.github/workflows/doc.yml

@@ -12,7 +12,7 @@ jobs:
     env:
       WIDOCO_DOWNLOAD_URL: https://github.com/dgarijo/Widoco/releases/download/v1.4.19/widoco-1.4.19-jar-with-dependencies_JDK-17.jar
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # use preinstalled Java
       #- uses: actions/setup-java@v3

.github/workflows/shacl.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: 'dist'