Fix publish tag glob

I thought this was a regex :)

.github/workflows/publish.yml

@@ -3,7 +3,7 @@ name: Publish to PyPI/github
 on:
   push:
     tags:
-      - '[0-9]+.[0-9]+.[0-9]+([ab][0-9]+)?'
+      - '[0-9]+.[0-9]+.[0-9]+[ab]?[0-9]?'
 
 jobs:
   build-n-publish: