Bump version 12.0.1.8.4

CHANGELOG:

## [12.0.1.8.4] - 2022-02-23
### Added
- [#757](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/757)  Add Orange filter in BA contracts tree view
- [#746](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/746) Allow Router 4G ticket creation

### Fixed
- [#759](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/759) Skip oneshot products and terminated lines
- [#755](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/755) Fix typo in date.range perms for group_user
- [#748](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/748) Set company name as first name and not lastname in OTRS tiquets
- [#738](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/738) Allow One Shot w/o cost products
- [#721](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/721) Create copy contract service info when holder change

### Changed
- [#753](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/753) Edit mm_fiber_coverage and orange_fiber_coverage visibility in change address wizard
- [#750](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/750) Adapt change tariff API's endpoint to work with both mobile and fiber contracts

Related card: https://trello.com/c/NuBCfkNt/1193-release-120184

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