fix pypi url

Author: rmjarvis

.github/workflows/publish.yml

@@ -14,7 +14,7 @@ jobs:
 
     environment:
       name: pypi
-      url: https://pypi.org/p/Piff
+      url: https://pypi.org/project/MockMPI/
     permissions:
       id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing