gracedb-2.28.2

• new certs for various gstlalcbc accounts ( ec491d0e)
• fix SSM label migration ( d11e61e9)
• upgrade django and gunicorn, and update gunicorn settings ( a30d684e, 9f266f58, 269704ba)
• adjust apache proxy settings ( 3aaa7675)
• improve memory management for large web queries ( c5c7ed0f)
• Adjust table formatting ( 75df4a00)
• Add time-to-alert to beta reports page (!232 (merged))
• "fix" ligolw xml rendering in the browser (sentry, fix: b889d289)

Also to be deployed:

• Support for federated proxy logins (https://git.ligo.org/computing/gracedb/deployment/-/merge_requests/6)