update checkout action

Author: heather999

.github/workflows/desc-python-dev.yml

@@ -29,7 +29,7 @@ jobs:
         uses: docker/setup-buildx-action@v1
 
       - name: checkout desc-python
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           ref: ''
           fetch-depth: 1