switch setuptools-scm write_to (deprecated) to version_file

[braingram]

Description

Switch setuptools-scm write_to (deprecated) to the non-deprecated version_file.

Fixes https://github.com/asdf-format/asdf/issues/1742

Checklist:

• [ ] pre-commit checks ran successfully
• [ ] tests ran successfully
• [ ] for a public change, a changelog entry was added
• [ ] for a public change, documentation was updated
• [ ] for any new features, unit tests were added

[zacharyburnett]

SCSB-138