Bump version 12.0.1.8.0

CHANGELOG:

## [12.0.1.8.0] - 2022-02-01
### Added
- [#735](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/735) Add Partner lang to Contract model and show it in the Contracts tree view.

### Fixed
- [#734](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/734) Assign name to router4G new contract when changing holders

### Changed
- [#729](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/729) Remove cancel button from planned activities
- [#710](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/710) Disable tracking in cron_compute_current_tariff_contract_line
- [#684](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/684) Remove products with DadesAddicionals500MB_product_template from one shot wizard
- [#635](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/635) Set product data as noupdate="1"
- [#604](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/604) Make change tariff button available only for IT group

Related card: https://trello.com/c/dp1iJqvP/1154-release-120180

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