Merge pull request #27 from arduino/dependabot/github_actions/actions/checkout-3

Bump actions/checkout from 2 to 3

Author: per1234

.github/workflows/release.yml

@@ -260,7 +260,7 @@ jobs:
 
     steps:
       - name: Checkout repository # we need package_index.template
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Download artifact
         uses: actions/download-artifact@v3