Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci-package-motion-diff.yml

@@ -17,7 +17,7 @@ jobs:
     name: build-and-test-package-motion-diff
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: 'Install Node'
         uses: actions/setup-node@v6

.github/workflows/continuous-integration.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone main repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           repository: OpenSlides/OpenSlides
           path: "."
@@ -33,7 +33,7 @@ jobs:
         run: rm -r openslides-client
 
       - name: Clone openslides-client
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           path: "./openslides-client"
 
@@ -101,7 +101,7 @@ jobs:
     name: build-and-test-dev-image
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           submodules: "recursive"
 

.github/workflows/pick-to-staging.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout main
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           ref: main
           fetch-depth: 2