Drop unused variable in extended_protocol_resqueue

paramValues is declared and never used. The GNUmakefile builds
extended_protocol_resqueue without the usual warning flags, so nothing
has reported it; with -Wall the compiler warns about it.

Assisted-by: Claude Code

src/test/regress/extended_protocol_resqueue.c

diff --git a/src/test/regress/extended_protocol_resqueue.c b/src/test/regress/extended_protocol_resqueue.c
index 1932f28..c1e4b84 100644
--- a/src/test/regress/extended_protocol_resqueue.c
+++ b/src/test/regress/extended_protocol_resqueue.c
@@ -31,7 +31,6 @@
 	const char *execrole;
 	PGconn     *conn;
 	PGresult   *res;
-	const char *paramValues[1];
 	char		buf[80];
 
 	conninfo = argv[1];