Fix publish workflow tag pattern - remove 'v' prefix

Pub.dev expects tags without 'v' prefix (1.0.0-alpha.1, not v1.0.0-alpha.1).
Updated workflow trigger pattern to match semver without prefix.

Error: Expected tag '1.0.0-alpha.1' but got 'refs/tags/v1.0.0-alpha.1'

Author: anilcancakir

.github/workflows/publish.yml

@@ -3,7 +3,7 @@ name: Publish to pub.dev
 on:
   push:
     tags:
-      - "v[0-9]+.[0-9]+.[0-9]+*"
+      - "[0-9]+.[0-9]+.[0-9]+*"
 
 jobs:
   publish: