Run release on all tags

The v6.0.0 tag didn't publish a release since it wasn't matching
the regular expression. This updates the expression to the same
one we use in Mockito core.

Fixes #539

Author: TimvdLippe

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ on:
     branches:
       - main
     tags:
-      - 5.*
+      - v*
   pull_request:
     branches:
       - main