MDEV-19519 mysql_install_db.exe doesn't set password_last_changed for newly created password

sql/mysql_install_db.cc

@@ -364,11 +364,12 @@ static int create_myini()
 
 static const char update_root_passwd_part1[]=
   "UPDATE mysql.global_priv SET priv=json_set(priv,"
+  "'$.password_last_changed', UNIX_TIMESTAMP(),"
   "'$.plugin','mysql_native_password',"
   "'$.authentication_string',PASSWORD(";
 static const char update_root_passwd_part2[]=
   ")) where User='root';\n";
-static const char remove_default_user_cmd[]= 
+static const char remove_default_user_cmd[]=
   "DELETE FROM mysql.user where User='';\n";
 static const char allow_remote_root_access_cmd[]=
   "CREATE TEMPORARY TABLE tmp_user LIKE global_priv;\n"