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] <[email protected]>

.github/workflows/checkbuild.yml

@@ -11,7 +11,7 @@ jobs:
     name: check if result.html is up to date with index.html
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: install nodejs
         run: sudo apt-get update && sudo apt-get -y install nodejs npm && npm install inline-source
       - name: modify build sccript

.github/workflows/linters.yml

@@ -11,7 +11,7 @@ jobs:
     name: Javascript linter (standard)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Init yarn
         run: yarn install
       - name: Run Standard
@@ -21,7 +21,7 @@ jobs:
     name: CSS linter (stylelint)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Init yarn
         run: yarn install
       - name: Run stylelint
@@ -30,7 +30,7 @@ jobs:
     name: HTML linter (html5validator) 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: Cyb3r-Jak3/[email protected]
         with:
           root: html/