`charmcraft pack` does not recognize updated `charmcraft.yaml` file
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Current evaluation
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Issue body
### Bug Description
Originally reported by @jugmac00, moved to craft-parts: https://github.com/canonical/craft-parts/issues/496
Once there's a craft-parts patch release we should be able to bring it into charmcraft.
### To Reproduce
See https://github.com/canonical/craft-parts/issues/496
### Environment
See https://github.com/canonical/craft-parts/issues/496
### charmcraft.yaml
```shell
See https://github.com/canonical/craft-parts/issues/496
```
### Relevant log output
```shell
See https://github.com/canonical/craft-parts/issues/496
```
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