🐝 update LICENSE.md copyright date from 2022 to 2024

Quick links (staging server): Site	Admin	Wizard

Login: ssh owid@staging-site-licence-update

Site-screenshots: https://github.com/owid/site-screenshots/compare/licence-update
SVG tester: https://github.com/owid/owid-grapher-svgs/compare/licence-update

SVG tester:

Number of differences (default views): 0 ✅ Number of differences (all views): 0 ✅

Edited: 2024-06-18 17:17:27 UTC Execution time: 1.11 seconds

owid / owid-grapher