Remove tags that are not supposed to have any updates anymore

- It doesn't make sense to keep the packaging rules for the
  deprecated QtProtobuf versions

.github/workflows/tagadd_old.yml

@@ -3,8 +3,6 @@ name: Release build
 on:
   push:
     tags:
-      - 'v0.1*'
-      - 'v0.2*'
       - 'v0.3*'
       - 'v0.4*'
       - 'v0.5*'