databases/rubygem-pg_query: update to 2.2.1

2.2.1 2023-01-20

    Detect tables used in the query of a PREPARE statement (#273)
    Expose recursive walk functionality via walk! (#268)
    Retain schema in name when parsing out functions (#272)

https://github.com/pganalyze/pg_query/blob/main/CHANGELOG.md