Fix object_group.sql's pgTAP plan count #30

Job	Run time
🔍 Detect changes & derive PG matrix	6s
🐘 PostgreSQL 16	58s
🐘 PostgreSQL 15	51s
🐘 PostgreSQL 14	57s
🐘 PostgreSQL 13	53s
🐘 PostgreSQL 17	59s
🐘 PostgreSQL 12	1m 3s
🐘 PostgreSQL 18	1m 2s
all-checks-passed	3s
	6m 52s

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