Bump actions/checkout from 5 to 6 (#1333)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
     if: ${{ github.repository == 'p4lang/behavioral-model' }}
     runs-on: [ubuntu-latest]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Determine Docker image tag
@@ -55,7 +55,7 @@ jobs:
     if: ${{ github.repository == 'p4lang/behavioral-model' && github.ref == 'refs/heads/main' }}
     runs-on: [ubuntu-latest]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
     - name: Set up Docker Buildx

.github/workflows/cmake.yml

@@ -30,7 +30,7 @@ jobs:
     name: ${{ matrix.config.name }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
 
@@ -66,7 +66,7 @@ jobs:
     name: "Build and install"
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
 

.github/workflows/doxygen.yml

@@ -11,7 +11,7 @@ jobs:
     name: Upload bmv2.org Doxygen documentation to S3
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Run Doxygen
       run: |
         docker run --rm -v $(pwd):/data hrektts/doxygen doxygen

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     name: Check whether tests need to be run based on diff
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: antrea-io/has-changes@v2
       id: check_diff
       with:
@@ -35,7 +35,7 @@ jobs:
         - cxx: clang++-10
           cc: clang-10
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: 'recursive'
     - name: Build test Docker image
@@ -60,7 +60,7 @@ jobs:
     if: ${{ needs.check-changes.outputs.has_changes == 'yes' }}
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: 'recursive'
     - name: Build Dockerfile.noPI image
@@ -75,7 +75,7 @@ jobs:
     if: ${{ needs.check-changes.outputs.has_changes == 'yes' }}
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: 'recursive'
     - name: Install dependencies