Bump actions/checkout from 2 to 4 (#376)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

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

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

.github/workflows/ci-unwelcome-words.yml

@@ -8,11 +8,11 @@ jobs:
     if: github.actor != 'dependabot[bot]'
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         ref: ${{ github.sha }}
     - name: Checkout tool
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         repository: exactpro-th2/ci-github-action
         ref: master