fix(contrib/drivers/mysql): use unreachable port for nodeInvalid test config (#4726)

## Summary
- Change nodeInvalid port from 3307 to 3316 (default 3306 + 10) so the
connection is guaranteed to fail as intended
- Port 3307 may collide with a running MariaDB instance in CI, causing
nodeInvalid to accidentally connect to a live database

ref #4689

contrib/drivers/mysql/mysql_z_unit_init_test.go

@@ -58,7 +58,7 @@ func init() {
 	nodePrefix.Prefix = TableNamePrefix1
 
 	nodeInvalid := gdb.ConfigNode{
-		Link:        fmt.Sprintf("mysql:root:%s@tcp(127.0.0.1:3307)/?loc=Local&parseTime=true", TestDbPass),
+		Link:        fmt.Sprintf("mysql:root:%s@tcp(127.0.0.1:3316)/?loc=Local&parseTime=true", TestDbPass),
 		TranTimeout: time.Second * 3,
 	}
 	gdb.AddConfigNode("test", nodeDefault)