chore(deps): update actions/checkout action to v2 (#118)

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

Author: renovate[bot]

.github/workflows/size-limit.yml

@@ -9,7 +9,7 @@ jobs:
     env:
       CI_JOB_NUMBER: 1
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - uses: andresz1/[email protected]
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}