Bump version to 12.0.1.1.12

CHANGELOG:

## [12.0.1.1.12] - 2021-03-03

### Added
- [#395](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/395) Checks if there's already a contract with the same ticket number

### Fixed
- [#399](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/399) Shows an error if there is not any mandate in partner that matches with the acc number in contract creation

### Changed
- [#389](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/389) Contract creation API moved to Queue Job

### Removed
- [#401](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/401) Removed old unused delivery_address and service_address for ISP Info creation in tests

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