Changing charmcraft.yaml doesn't update the resulting charm's metadata.yaml
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Issue body
### Bug Description
A change to charmcraft.yaml + re-packing doesn't change metadata.yaml
### To Reproduce
Change charmcraft.yaml, re-pack, check metadata.yaml
### Environment
charmcraft edge
### charmcraft.yaml
```shell
any
```
### Relevant log output
```shell
n/a
```
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