Bump actions/checkout from 3 to 4 (#29)

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/ci.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout current repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
@@ -37,7 +37,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Checkout telegram-bot-api repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: tdlib/telegram-bot-api
           path: telegram-bot-api
@@ -88,7 +88,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: build
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Docker Hub Description
         uses: peter-evans/dockerhub-description@v3
         with: