.github/workflows/deploy_release.yml: Fix tag selection

These are not regular expressions, see [1]. So let's use something really
simple instead.

[1]: https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#filter-pattern-cheat-sheet

Author: t-b

.github/workflows/deploy_release.yml

@@ -2,7 +2,7 @@ name: Deploy release
 on:
   push:
    tags:
-     - '^v\d+(\.\d+)*(\.[0-9A-Za-z]*)*'
+     - '^v[0-9]+.[0-9]+.[0-9]+'
 
 jobs:
   common-actions: