v30.4.0

This is a minor release without API changes:

• Use latest skeleton
• Update license list to latest ScanCode and SPDX 3.25
• Drop support for Python 3.8

What's Changed

• Update licensedb to 3.24 by @xhochy in #102
• Update licenses with SPDX license list 3.25 by @AyanSinhaMahapatra in #104
• Update README and setup.cfg by @AyanSinhaMahapatra in #105

New Contributors

• @xhochy made their first contribution in #102

Full Changelog: v30.3.1...v30.4.0