Retry GraceDB 500 Internal Server Error

There are 500 errors that are retryable, created due to a race condition between the internal file versioning and aws file system. See the comment: https://chat.ligo.org/ligo/pl/98jgakexx7r3je8fbth85ey7ww

Sentry Errors here: https://ligo-caltech.sentry.io/issues/?environment=test01&environment=playground&environment=production&environment=test&project=1425216&query=is%3Aunresolved+500+Server+Error&referrer=issue-list&statsPeriod=90d

This can be fixed via an additional entry here: https://git.ligo.org/emfollow/gwcelery/-/blob/9a989631da8ca9e5bac0301193302552a5721f3c/gwcelery/tasks/gracedb.py#L35