Remove use of utf8_encode (deprecated in PHP 8.2) #663

Job	Run time
ci / check if job needs to run	5s
ci / prepare test matrix	11s
ci / master - pgsql - php 8.1 - tool_objectfs	5m 52s
ci / MOODLE_402_STABLE - pgsql - php 8.0 - tool_objectfs	5m 18s
ci / MOODLE_402_STABLE - mariadb - php 8.0 - tool_objectfs	5m 46s
ci / MOODLE_402_STABLE - pgsql - php 8.1 - tool_objectfs	5m 28s
ci / MOODLE_402_STABLE - mariadb - php 8.1 - tool_objectfs	5m 53s
ci / MOODLE_403_STABLE - pgsql - php 8.0 - tool_objectfs	5m 41s
ci / MOODLE_403_STABLE - mariadb - php 8.0 - tool_objectfs	6m 5s
ci / MOODLE_403_STABLE - mariadb - php 8.2 - tool_objectfs	6m 6s
ci / MOODLE_403_STABLE - pgsql - php 8.2 - tool_objectfs	5m 43s
ci / MOODLE_404_STABLE - pgsql - php 8.1 - tool_objectfs	5m 50s
ci / MOODLE_404_STABLE - pgsql - php 8.3 - tool_objectfs	5m 51s
ci / MOODLE_404_STABLE - mariadb - php 8.1 - tool_objectfs	6m 6s
ci / MOODLE_404_STABLE - mariadb - php 8.3 - tool_objectfs	6m 47s
ci / Release to the Moodle plugin directory	0s
	1h 16m 42s

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