Update actions/checkout action to v3 (#39)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: actions/setup-node@v2
         with:
@@ -53,7 +53,7 @@ jobs:
     needs: ['test']
     if: "!contains(github.event.head_commit.message, 'skip-release') && !contains(github.event.head_commit.message, 'skip-ci') && github.event_name != 'pull_request'"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-node@v2
         with:
           node-version: 14.x