v1.23.21 / 2024-11-04

What's Changed

• Moves mlab4-geg01 from staging to sandbox by @nkinkade in #351
• Produces sites.json, but for retired sites in v2 format by @nkinkade in #352
• Retires site HND05 by @nkinkade in #353

Full Changelog: v1.23.20...v1.23.21