chore(deps): update actions/checkout action to v4

| datasource  | package          | from | to |
| ----------- | ---------------- | ---- | -- |
| github-tags | actions/checkout | v2   | v4 |

.github/workflows/ci.yml

@@ -12,11 +12,11 @@ jobs:
         if: ${{ github.event_name == 'pull_request' }}
         env:
           COUNT: ${{ github.event.pull_request.commits }}
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         if: ${{ github.event_name == 'pull_request' }}
         with:
           fetch-depth: ${{ env.commits_count_incr }}
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         if: ${{ github.event_name != 'pull_request' }}
       - id: nvm
         run: echo "##[set-output name=NVMRC;]$(cat .nvmrc)"