Merge pull request #20 from arduino/dependabot/github_actions/actions/setup-python-3

Bump actions/setup-python from 2 to 3

Author: per1234

.github/workflows/libraries_report-size-deltas.yml

@@ -25,7 +25,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: '3.9.4'