Resolve php7.4+ error in unit tests #32

Job	Run time
ci / check if job needs to run	8s
ci / prepare test matrix	1m 11s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - tool_redirects	3m 54s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - tool_redirects	2m 26s
ci / MOODLE_33_STABLE - mariadb - php 7.1 - tool_redirects	2m 21s
ci / MOODLE_34_STABLE - pgsql - php 7.1 - tool_redirects	3m 43s
ci / MOODLE_35_STABLE - mariadb - php 7.1 - tool_redirects	2m 32s
ci / MOODLE_35_STABLE - pgsql - php 7.1 - tool_redirects	3m 41s
ci / MOODLE_35_STABLE - mariadb - php 7.2 - tool_redirects	2m 6s
ci / MOODLE_35_STABLE - pgsql - php 7.2 - tool_redirects	2m 32s
ci / MOODLE_36_STABLE - mariadb - php 7.1 - tool_redirects	2m 18s
ci / MOODLE_37_STABLE - pgsql - php 7.2 - tool_redirects	2m 23s
ci / MOODLE_38_STABLE - mariadb - php 7.3 - tool_redirects	2m 55s
ci / MOODLE_39_STABLE - mariadb - php 7.2 - tool_redirects	2m 46s
ci / MOODLE_39_STABLE - mariadb - php 7.3 - tool_redirects	3m 26s
ci / MOODLE_39_STABLE - pgsql - php 7.3 - tool_redirects	3m 3s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - tool_redirects	2m 58s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_redirects	4m 37s
ci / MOODLE_39_STABLE - pgsql - php 7.2 - tool_redirects	3m 2s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_redirects	3m 1s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_redirects	3m 47s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_redirects	3m 10s
ci / Release to the Moodle plugin directory	0s
	1h 2m 0s

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