Collection tags not up to date
There is a strange bug where the semantic does not seem to be always up-to-date.
Seen in https://forum.geocommuns.fr/t/panoramax-sur-data-gouv-fr/2902/29
And when I look at a sequence, the tags are not up to date:
```
❯ xh https://api.panoramax.xyz/api/collections/92219fc0-0a24-486b-b744-b5aa4b53143e | jq '.semantics'
[]
~
❯ xh https://panoramax.ign.fr/api/collections/92219fc0-0a24-486b-b744-b5aa4b53143e | jq '.semantics'
[
{
"key": "transport",
"value": "car"
}
]
```
Maybe adding tags afterward do not update the `updated_at` of the collection?
issue