rgw: update keystone repo stable branch to 2024.2

The stable/2024.1 is gone from the github repo:

  https://github.com/openstack/keystone.git

Fixes: https://tracker.ceph.com/issues/73800
Signed-off-by: Kyr Shatskyy <kyrylo.shatskyy@clyso.com>
(cherry picked from commit 998e4299af417221ac8102fe46c46967e88f0da4)

Merge pull request #65584 from rzarzynski/wip-bug-72412-squid

squid: osd: stop scrub_purged_snaps() from ignoring osd_beacon_report_interval

Reviewed-by: Prashant D <pdhange@redhat.com>