fix: bump actions/checkout from 2.4.0 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.4.0 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.4.0...v3)

---
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/test.yml

@@ -15,7 +15,7 @@ jobs:
           - ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
       - uses: ./
       - run: specdown --help
 
@@ -28,7 +28,7 @@ jobs:
           - ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
       - uses: ./
         with:
           version: 0.55.5
@@ -37,7 +37,7 @@ jobs:
   lint-markdown:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
       - uses: PurpleBooth/gfmfmt-action@v2.0.6
 
   versio-plan:
@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
       - uses: chaaz/versio-actions/install@v1.2
@@ -71,7 +71,7 @@ jobs:
       previous_version: ${{ steps.previous_version.outputs.previous_version }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           fetch-depth: 0
@@ -96,7 +96,7 @@ jobs:
       - release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
         name: Checkout the repository
         with:
           lfs: true