Post-release cleanup of docs/changelogs/v1.3.0.md so the notes match
what users actually experience in the released v1.3.0:
- Rewrite the postgres major-features entry so author (myasnikovdaniil),
PR (#2369), and description all match the 17.7-standard-trixie pin +
migration-37 imageName rewrite that actually shipped. The previous
entry credited #2304 (superseded spec.version=v17 backfill approach).
- Remove the duplicate #2364 postgres bug-fix entry; the same work is
now folded into the single major-features entry above, with backport
references to #2309 (v1.2.1) and #2364 (v1.2.2).
- Remove the [linstor-gui] Restrict to cozystack-cluster-admin group
security entry. The vulnerable state never shipped in a tagged
release, so there is nothing user-facing to announce; the restriction
is already described in the linstor-gui Feature Highlights section
as part of the feature's day-one behavior.
Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>