Do pre-release housekeeping on catalog data.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: c2f436151edc818601c2499e400e1ad53d0da66f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2022-05-12T19:35:15Z
Releases: 15.0
Do pre-release housekeeping on catalog data.

Run renumber_oids.pl to move high-numbered OIDs down, as per pre-beta
tasks specified by RELEASE_CHANGES.  For reference, the command was

./renumber_oids.pl --first-mapped-oid 8000 --target-oid 6205

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