databases/mongodb70: 7.0.23

Includes patch to implement waitable atomics for FreeBSD for
https://jira.mongodb.org/browse/SERVER-81797.
This patch is developed by me. It did not go through QA of MongoDB Inc.
I asked to upstream the patch but they don't want to take responsibilty
for code they don't run themselves. (Which I can understand from their
perspective.)
https://github.com/mongodb/mongo/pull/1607#issuecomment-2996276435
https://jira.mongodb.org/browse/SERVER-99225
Anyway, this has run without errors for a while on my Raspberry Pi + net-mgmt/unifi9.
I don't have full QA in place and could only do limited testing. I can't
take any responsibilty for the quality of the patch.

Make backups and test for yourself in your setup before upgrading
any critical production environment.

Changes:
https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.23---aug-13--2025

Announcement:
https://www.mongodb.com/community/forums/t/mongodb-7-0-23-is-released/327242?u=r_k