fix(semantic-release): upgrade checkout version

Author: natedunn

.github/workflows/semantic-release.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
       - name: Setup Node.js
         uses: actions/setup-node@v1
         with: