Bump actions/checkout from 4 to 6 (#146)

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -33,7 +33,7 @@ jobs:
       CCACHE_DIR: ${{ github.workspace }}/.ccache
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Cache ccache
         uses: actions/cache@v4
         with:
@@ -89,7 +89,7 @@ jobs:
       CCACHE_DIR: ${{ github.workspace }}/.ccache
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Cache ccache
         uses: actions/cache@v4
         with:

.github/workflows/docs.yaml

@@ -20,7 +20,7 @@ jobs:
     container: ghcr.io/picknikrobotics/rsl:upstream-rolling
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Setup Pages
         uses: actions/configure-pages@v5
       - name: Source ROS

.github/workflows/format.yaml

@@ -12,7 +12,7 @@ jobs:
     name: pre-commit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
       - name: Install clang-format
         run: sudo apt-get install clang-format