Define usage of setuptools_scm in pyproject.toml

[dafeda]

Usage from setup.py is deprecated

Pre review checklist

• [x] Added appropriate release note label
• [x] PR title captures the intent of the changes, and is fitting for release notes.
• [x] Commit history is consistent and clean, in line with the contribution guidelines.

Adding labels helps the maintainers when writing release notes. This is the list of release note labels.