databases/pgpool-II-33: Update from 3.3.20 to 3.3.22

Changelogs:

• http://www.pgpool.net/docs/latest/en/html/release-3-3-21.html
• http://www.pgpool.net/docs/latest/en/html/release-3-3-22.html

Please note that 3.3.22 is the last release of 3.3 series.