Drop replacement of build timestamps as we don't have a feed in this repo

Author: PeterJCLaw

.github/workflows/publish.yml

@@ -115,9 +115,6 @@ jobs:
           name: build-from-main
           path: main
 
-      - name: Replace build timestamps
-        run: sed -i -r '1 s_<updated>[^/]+</updated>_<updated>NOW</updated>_' {main,local}/feed.xml
-
       - name: Diff
         id: diff
         run: |