parse_iso_timestamp: handle Z properly
pgq_node: avoid concurrency in promote/demote
fixed subscriber_info_watermark_name_fkey violation

(introduced in commit 0466144)
sql/pgq_ext/structure/tables.sql: fixed some typos
Merge branch 'master' of https://github.com/markokr/skytools into hotfix/3.2.5
bumping up schemata's versions in preparation for upcoming release
v3.2.5
Merge branch 'hotfix/3.2.5'