Bump version 12.0.1.8.6
CHANGELOG:
## [12.0.1.8.6] - 2022-03-09
### Added
- [#772](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/772) Add Change Tariff BA button
### Fixed
- [#771](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/771) Allow non-string values for 'start_date' as change tariff API parameter