chore(deps): bump actions/checkout from 2 to 3 (#349)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3)

---
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/continuous-integration.yml

@@ -11,7 +11,7 @@ jobs:
         node-version: [12.x]
     steps:
       - name: 'Checkout repository'
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: 'Use Node.js v${{ matrix.node-version }}'
         uses: actions/setup-node@v3
         with:

.github/workflows/merge-dependencies.yml

@@ -14,7 +14,7 @@ jobs:
     if: github.actor == 'dependabot[bot]'
     steps:
       - name: 'Checkout repository'
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v3
       - name: 'Automerge dependency updates from Dependabot'
         uses: ahmadnassri/action-dependabot-auto-merge@v2.6
         # Guarantee that commit comes from Dependabot (don't blindly trust external GitHub Actions)