Bump actions/checkout from 3 to 4 (#278)

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

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: [ubuntu-latest]
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Use Java for gradle
         uses: actions/setup-java@v4
         with:
@@ -61,7 +61,7 @@ jobs:
        with:
          node-version: 16
      - name: Checkout
-       uses: actions/checkout@v3
+       uses: actions/checkout@v4
      - name: Download generated site
        uses: actions/download-artifact@v4
        with:

.github/workflows/linkinator.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: [ubuntu-latest]
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: "run linkinator" 
         run: |
           npm run build:linkinator

.github/workflows/publish.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: [ubuntu-latest]
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Java
         uses: actions/setup-java@v4
         with:
@@ -61,7 +61,7 @@ jobs:
        with:
          node-version: 16
      - name: Checkout
-       uses: actions/checkout@v3
+       uses: actions/checkout@v4
      - name: Download generated site
        uses: actions/download-artifact@v4
        with: