DROP PACKAGE leaves PACKAGE BODY grant in mysql.procs_priv causing privilege escalation

`DROP PACKAGE` removes both `mysql.proc` rows but only the `PACKAGE` row from `mysql.procs_priv`, leaving the `PACKAGE BODY` grant orphaned. Since `PACKAGE BODY` is the type that gates execution, a package later created under the same name is executable by the old grantee without any grant on it, …

=== grants before drops ===
Routine_name    Routine_type
c_func          FUNCTION
c_pkg           PACKAGE BODY
c_pkgbody       PACKAGE BODY
c_proc          PROCEDURE

=== grants after drops ===
Routine_name    Routine_type    Proc_priv
c_pkg           PACKAGE BODY    Execute