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Fix transformation specification fixture lookup #84

Job	Run time
Build and install package artifact	1m 26s
PostgreSQL 18 integration	1m 16s
MySQL 8.4 integration	1m 14s
MariaDB 11.4 integration	1m 7s
MariaDB 11.8 integration	1m 7s
PostgreSQL 17 integration	1m 6s
test (3.14)	1m 2s
test (3.13)	1m 4s
test (3.11)	53s
MySQL 9.7 integration	1m 10s
test (3.12)	1m 10s
MariaDB 12.3 integration	1m 4s
	13m 39s