add missing line to test ref file

Author: arthurpassos

tests/queries/0_stateless/01271_show_privileges.reference

@@ -133,6 +133,7 @@ SYSTEM DROP PAGE CACHE	['SYSTEM DROP PAGE CACHE','DROP PAGE CACHE']	GLOBAL	SYSTE
 SYSTEM DROP SCHEMA CACHE	['SYSTEM DROP SCHEMA CACHE','DROP SCHEMA CACHE']	GLOBAL	SYSTEM DROP CACHE
 SYSTEM DROP FORMAT SCHEMA CACHE	['SYSTEM DROP FORMAT SCHEMA CACHE','DROP FORMAT SCHEMA CACHE']	GLOBAL	SYSTEM DROP CACHE
 SYSTEM DROP S3 CLIENT CACHE	['SYSTEM DROP S3 CLIENT','DROP S3 CLIENT CACHE']	GLOBAL	SYSTEM DROP CACHE
+SYSTEM DROP PARQUET METADATA CACHE	['SYSTEM DROP PARQUET METADATA CACHE']	GLOBAL	SYSTEM DROP CACHE
 SYSTEM DROP CACHE	['DROP CACHE']	\N	SYSTEM
 SYSTEM RELOAD CONFIG	['RELOAD CONFIG']	GLOBAL	SYSTEM RELOAD
 SYSTEM RELOAD USERS	['RELOAD USERS']	GLOBAL	SYSTEM RELOAD