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/bibtex.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v6

.github/workflows/cibuildwheel.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Cloning SUMO
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: sumo
           fetch-depth: 0
@@ -91,7 +91,7 @@ jobs:
 
     steps:
     - name: Cloning SUMO
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         filter: tree:0

.github/workflows/docker.yml

@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Log in to the Container registry
         uses: docker/login-action@v3

.github/workflows/documentation.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Cloning repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Installing plantuml
       run: |
@@ -57,7 +57,7 @@ jobs:
         restore-keys: cache-lychee-
 
     - name: Cloning repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Lychee Link Checker
       uses: lycheeverse/lychee-action@v2

.github/workflows/draft-pdf.yml

@@ -12,7 +12,7 @@ jobs:
     name: Paper Draft
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Build draft PDF
         uses: openjournals/openjournals-draft-action@master

.github/workflows/i18n.yml

@@ -15,7 +15,7 @@ jobs:
         run: sudo apt-get update && sudo apt-get install -y gettext
 
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v6

.github/workflows/jupedsim-windows.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
     - name: Cloning jupedsim
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: PedestrianDynamics/jupedsim
         ref: ${{ matrix.jps_version }}
@@ -43,12 +43,12 @@ jobs:
 
     - name: Cloning SUMO
       # this does not a full clone to speed up the build, version number will be incorrect
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         path: sumo
 
     - name: Cloning SUMO Libraries
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: DLR-TS/SUMOLibraries
         path: SUMOLibraries

.github/workflows/linux-wheels.yml

@@ -26,7 +26,7 @@ jobs:
     steps:
     - name: Cloning SUMO
       if: github.event.schedule != '5 8 * * *'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         filter: tree:0
@@ -84,7 +84,7 @@ jobs:
 
     steps:
     - name: Cloning SUMO
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Downloading Wheels artifact
       if: github.event.schedule != '5 8 * * *'

.github/workflows/linux.yml

@@ -32,7 +32,7 @@ jobs:
 
     steps:
     - name: Cloning SUMO
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         path: sumo
         fetch-depth: 0
@@ -63,7 +63,7 @@ jobs:
 
     - name: Cloning jupedsim
       if: matrix.build_type == 'full' && matrix.compiler == 'gcc'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: PedestrianDynamics/jupedsim
         ref: ${{ matrix.jps_version }}

.github/workflows/macos-wheels.yml

@@ -32,7 +32,7 @@ jobs:
 
     steps:
     - name: Cloning SUMO
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         filter: tree:0
@@ -98,7 +98,7 @@ jobs:
 
     steps:
     - name: Cloning SUMO
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Downloading Wheels artifact
       uses: actions/download-artifact@v6