List 006_login_trigger.pl test for meson

Reported-by: Thomas Munro
Discussion: https://postgr.es/m/CA%2BhUKGLuqDUaYYhJnA1H1q5Z-k18kQHoEqZ5fiXtTi4038nspg%40mail.gmail.com

Author: akorotkov

src/test/authentication/meson.build

@@ -11,6 +11,7 @@ tests += {
       't/003_peer.pl',
       't/004_file_inclusion.pl',
       't/005_sspi.pl',
+      't/006_login_trigger.pl',
     ],
   },
 }