[15.0][IMP] subscription_oca: Add previous contributors

[carlos-domatix]

Sorry, previous contributors forgotten in https://github.com/OCA/contract/pull/971I add them.

@simahawk

[github-actions[bot]]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days. If you want this PR to never become stale, please ask a PSC member to apply the "no stale" label.

[rvalyi]

@carlos-domatix may be you should ping the recent contributors to approve this...