fix: delete old (untracked) files in s3 (#1279)

Author: kernelwhisperer

.github/workflows/s3Deploy.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Upload to S3
         run: |
           aws s3 cp src/public/CowSwap.json s3://files.cow.fi/tokens/CowSwap.json
-          aws s3 sync src/public s3://files.cow.fi/token-lists
+          aws s3 sync src/public s3://files.cow.fi/token-lists --delete
 
       - name: Invalidate CloudFront cache
         run: |