build: bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

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

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
           - compiler: clang
             config-args: "--without-snmp --with-xml"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - name: Unshallow repository
@@ -82,7 +82,7 @@ jobs:
               --without-xml
             release: true
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - name: Install stuff
@@ -114,7 +114,7 @@ jobs:
             runner: macos-latest
     runs-on: ${{ matrix.os.runner }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - name: Test on ${{ matrix.os.name }}
@@ -138,7 +138,7 @@ jobs:
     name: Build Docker images
     if: github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/')
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: docker/setup-qemu-action@v2
       - uses: docker/setup-buildx-action@v2
       - uses: docker/metadata-action@v4

.github/workflows/coverity.yml

@@ -12,7 +12,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - name: Fetch latest Coverity Scan MD5

.github/workflows/style.yml

@@ -9,7 +9,7 @@ jobs:
   style-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v22
       - name: Check Python/C style
         run: |