migration-guides/release-notes-5.2: update for upcoming 5.2 release

Changes since 87d73414 ("python3-iniparse: remove recipe") up to
9cd6b3ad ("cronie: Resolve build failure with GCC15") in Poky.

(From yocto-docs rev: ea1636013722c12e72ca115240c8ce533e05ece2)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>