Fix regex in Mysql2 adapter #973

Job	Run time
Ruby 3.2 / semian	3m 25s
Ruby 3.1 / semian	3m 10s
Ruby 3.2 / grpc	11m 8s
Ruby 3.2 / mysql2	1m 26s
Ruby 3.0 / semian	3m 5s
Ruby 3.2 / net_http	1m 2s
Ruby 2.7 / semian	3m 10s
Ruby 3.2 / rails_mysql2	59s
Ruby 3.2 / rails_trilogy	1m 32s
Ruby 3.2 / redis_4	1m 13s
Ruby 3.2 / redis_5	1m 18s
Ruby 3.2 / redis_client	1m 14s
Ruby 3.2 / activerecord_trilogy_adapter	2m 14s
Ruby 3.1 / grpc	1m 24s
Ruby 3.1 / mysql2	1m 19s
Ruby 3.1 / net_http	1m 18s
Ruby 3.1 / rails_mysql2	1m 19s
Ruby 3.1 / rails_trilogy	1m 31s
Ruby 3.1 / redis_4	1m 1s
Ruby 3.1 / redis_5	1m 10s
Ruby 3.1 / redis_client	1m 23s
Ruby 3.1 / activerecord_trilogy_adapter	2m 1s
Ruby 3.0 / grpc	1m 13s
Ruby 3.0 / mysql2	1m 17s
Ruby 3.0 / net_http	1m 1s
Ruby 3.0 / rails_mysql2	1m 12s
Ruby 3.0 / rails_trilogy	1m 24s
Ruby 3.0 / redis_4	1m 6s
Ruby 3.0 / redis_5	1m 4s
Ruby 3.0 / redis_client	1m 9s
Ruby 3.0 / activerecord_trilogy_adapter	1m 49s
Ruby 2.7 / grpc	1m 22s
Ruby 2.7 / mysql2	1m 22s
Ruby 2.7 / net_http	1m 20s
Ruby 2.7 / rails_mysql2	1m 6s
Ruby 2.7 / rails_trilogy	1m 26s
Ruby 2.7 / redis_4	1m 18s
Ruby 2.7 / redis_5	1m 31s
Ruby 2.7 / redis_client	1m 25s
Ruby 2.7 / activerecord_trilogy_adapter	2m 6s
	1h 11m 33s

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