issue #68: fix report builder errors #221

Job	Run time
ci / check if job needs to run	5s
ci / prepare test matrix	12s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_dynamic_cohorts	3m 23s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	3m 21s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_dynamic_cohorts	3m 8s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	3m 41s
ci / MOODLE_402_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	3m 7s
ci / MOODLE_402_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	3m 21s
ci / MOODLE_402_STABLE - pgsql - php 8.1 - tool_dynamic_cohorts	3m 17s
ci / MOODLE_402_STABLE - mariadb - php 8.1 - tool_dynamic_cohorts	3m 15s
ci / MOODLE_403_STABLE - pgsql - php 8.2 - tool_dynamic_cohorts	3m 39s
ci / MOODLE_403_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	3m 30s
ci / MOODLE_403_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	3m 22s
ci / MOODLE_403_STABLE - mariadb - php 8.2 - tool_dynamic_cohorts	3m 51s
ci / Release to the Moodle plugin directory	0s
	41m 12s

Provide feedback