Bump actions/checkout from 3 to 4 (ros-controls#93)

.github/workflows/build-foxy.yml

@@ -25,7 +25,7 @@ jobs:
       BASEDIR: ${{ github.workspace }}/.work
       CACHE_PREFIX: ${{ matrix.env.ROS_DISTRO }}-${{ matrix.env.ROS_REPO }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # The target directory cache doesn't include the source directory because
       # that comes from the checkout.  See "prepare target_ws for cache" task below
       - name: cache target_ws

.github/workflows/build-galactic.yml

@@ -25,7 +25,7 @@ jobs:
       BASEDIR: ${{ github.workspace }}/.work
       CACHE_PREFIX: ${{ matrix.env.ROS_DISTRO }}-${{ matrix.env.ROS_REPO }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # The target directory cache doesn't include the source directory because
       # that comes from the checkout.  See "prepare target_ws for cache" task below
       - name: cache target_ws

.github/workflows/build-humble.yml

@@ -25,7 +25,7 @@ jobs:
       BASEDIR: ${{ github.workspace }}/.work
       CACHE_PREFIX: ${{ matrix.env.ROS_DISTRO }}-${{ matrix.env.ROS_REPO }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # The target directory cache doesn't include the source directory because
       # that comes from the checkout.  See "prepare target_ws for cache" task below
       - name: cache target_ws

.github/workflows/build-rolling.yml

@@ -25,7 +25,7 @@ jobs:
       BASEDIR: ${{ github.workspace }}/.work
       CACHE_PREFIX: ${{ matrix.env.ROS_DISTRO }}-${{ matrix.env.ROS_REPO }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # The target directory cache doesn't include the source directory because
       # that comes from the checkout.  See "prepare target_ws for cache" task below
       - name: cache target_ws

.github/workflows/format.yml

@@ -12,7 +12,7 @@ jobs:
     name: Format
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/[email protected]
       with:
         python-version: '3.10'

.github/workflows/prerelease.yaml

@@ -21,6 +21,6 @@ jobs:
     name: "${{ matrix.distro }}"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: industrial_ci
         uses: ros-industrial/industrial_ci@master

.github/workflows/ros-lint.yml

@@ -11,7 +11,7 @@ jobs:
       matrix:
           linter: [copyright, lint_cmake]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ros-tooling/[email protected]
     - uses: ros-tooling/[email protected]
       with: