Flint 2.6.3 has been released

tarball: see checksums.ini [upstream_url]

Depends on #30805

Upstream: Reported upstream. Developers acknowledge bug.

CC: @timokau @kedlaya @jbalakrishnan @saraedum @isuruf @mkoeppe @kliem @videlec @w-bruns @slel

Component: packages: standard

Keywords: upgrade

Author: Dima Pasechnik, Matthias Koeppe

Branch/Commit: 7681b1a

Reviewer: Matthias Koeppe, Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/29719