[16.0] copier repo update

[nilshamerlinck]

to avoid the discrepancy of maintainer-tools version between:

• the pre-commit hook (old)
• the oca bot (up-to-date)

which leads to pre-commit re-adding the xml header in static/description.index.html (while we don't want it anymore, see here)

[github-actions]

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.

[StefanRijnhart]

Obsoleted by ca437ab. Thanks though!