Refactor Gitea workflow to remove redundant Python setup step

.gitea/workflows/update.yaml

@@ -10,10 +10,11 @@ jobs:
     runs-on: ubuntu-latest
     container:
       image: python:3.9-slim  
-steps:
+  steps:
         - name: Checkout Code
           uses: actions/checkout@v4
 
+        # DELETE the "Set up Python" step entirely
         
         - name: Update README file
           run: |