Bump version 12.0.2.5.5

CHANGELOG:

## [12.0.2.5.5] - 2024-01-23
### Changed
- [#1169](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/1169) Upgrade OTRS-SC version to 1.5.1 to adapt OTRS migration to version 8.

Related card: https://trello.com/c/gLla45qQ/1829-release-odoo-120255

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