Bump version 12.0.1.8.1

CHANGELOG:

### Added
- [#740](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/740) Allow to choose the starting date in change tariffs api calls
- [#716](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/716) Add street fields to otrs mobile ticket
- [#736](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/736) Add active field to mail.activity

Related card: https://trello.com/c/9dzdFbf5/1169-release-120181

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