build: correctly set version of dev builds

Metadata

Project: snapcraft
Number: #5568
Type: pull request
State: open
Author: bepri
Labels: —
Created: 2025-06-20 20:16:42+00:00
Updated: 2025-09-05 21:13:56+00:00
Closed: —

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Issue body

- [x] Have you followed the [guidelines for contributing](https://github.com/canonical/snapcraft/blob/main/CONTRIBUTING.md)? - [x] Have you signed the [CLA](http://www.ubuntu.com/legal/contributors/)? - [ ] Have you successfully run `make lint`? - [ ] Have you successfully run `make test`? ---

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