Bump version 12.0.1.1.21
CHANGELOG:
## [12.0.1.1.21] - 2021-04-14
### Fixed
- [#461](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/461) Fix contract holder change wizard to allow setting new contract's banking mandateCHANGELOG:
## [12.0.1.1.21] - 2021-04-14
### Fixed
- [#461](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/461) Fix contract holder change wizard to allow setting new contract's banking mandate