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] <[email protected]>

Author: dependabot[bot]

.github/workflows/abi.yaml

@@ -26,7 +26,7 @@ jobs:
     name: "check"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Cache ccache
         uses: rhaschke/cache@main

.github/workflows/ci.yaml

@@ -50,7 +50,7 @@ jobs:
     name: "${{ matrix.distro }} • ogre ${{ matrix.ogre }} • Qt ${{ matrix.qt }}${{ matrix.env.CLANG_TIDY && (github.event_name != 'workflow_dispatch' && ' • clang-tidy (delta)' || ' • clang-tidy (all)') || '' }}"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Cache ccache
         uses: rhaschke/cache@main

.github/workflows/format.yaml

@@ -13,7 +13,7 @@ jobs:
     name: pre-commit
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: rhaschke/install-catkin_lint-action@main
       - run: clang-format --version
       - uses: pre-commit/[email protected]

.github/workflows/prerelease.yaml

@@ -21,7 +21,7 @@ jobs:
     name: "${{ matrix.distro }}"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Cache ccache
         uses: rhaschke/cache@main
         with:

.github/workflows/robostack.yaml

@@ -18,7 +18,7 @@ jobs:
         os: [ubuntu-20.04, macos-latest, windows-latest]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Set up Build Dependencies
       uses: mamba-org/provision-with-micromamba@v11