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](https://github.com/actions/checkout/compare/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>

.github/workflows/build_appimage_bundle.yml

@@ -7,7 +7,7 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python 3.13
         uses: actions/setup-python@v6

.github/workflows/build_docker_image.yml

@@ -8,7 +8,7 @@ jobs:
     name: Build image and upload artifact
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -40,7 +40,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3

.github/workflows/build_nsis_bundle.yml

@@ -7,7 +7,7 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python 3.13
         uses: actions/setup-python@v6

.github/workflows/build_server.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout code for ${{ matrix.platform.name }}
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: DJ2LS/FreeDATA
 

.github/workflows/codeql-analysis.yml

@@ -39,7 +39,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: ${{ github.head_ref }}
 

.github/workflows/gui_tests.yml

@@ -23,7 +23,7 @@ jobs:
           - node-version: "24"
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Node.js, NPM and Yarn
         uses: actions/setup-node@v6
         with:

.github/workflows/modem_tests.yml

@@ -25,7 +25,7 @@ jobs:
           - python-version: "3.13"
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6

.github/workflows/pip_package.yml

@@ -5,7 +5,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Set up Python 3.13
       uses: actions/setup-python@v6

.github/workflows/prettier.yaml

@@ -12,7 +12,7 @@ jobs:
 
         steps:
             - name: Checkout
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
               with:
                   # Make sure the actual branch is checked out when running on pull requests
                   ref: ${{ github.head_ref }}