feat(db): use POSTGRES_USER in pg_backup; document it in release note
- pg_backup.sh: use the db service's POSTGRES_USER (default postgres) for the dump/drop/recreate instead of detecting the superuser at runtime, since the recipe now sets that env var; one-line the constants comment - release note: explain the in-place pg_upgrade + the POSTGRES_USER override - bump PG_BACKUP_VERSION v4 Verified on cctest: backup + restore via the hooks round-trips with POSTGRES_USER.
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