move to actions/checkout v4

Author: heather999

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

@@ -43,7 +43,7 @@ jobs:
           password: '${{ secrets.DOCKERHUB_ACCESSTOK }}'      
 
       - name: checkout desc-python
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           ref: bleed