Remove use of utf8_encode (deprecated in PHP 8.2) #658

Job	Run time
ci / check if job needs to run	5s
ci / prepare test matrix	8s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - tool_objectfs	3m 55s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - tool_objectfs	4m 3s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - tool_objectfs	3m 52s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_objectfs	5m 32s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_objectfs	6m 10s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_objectfs	5m 45s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_objectfs	7m 16s
ci / MOODLE_402_STABLE - pgsql - php 8.0 - tool_objectfs	5m 28s
ci / MOODLE_402_STABLE - mariadb - php 8.0 - tool_objectfs	5m 48s
ci / MOODLE_402_STABLE - pgsql - php 8.1 - tool_objectfs	5m 38s
ci / MOODLE_402_STABLE - mariadb - php 8.1 - tool_objectfs	5m 45s
ci / Release to the Moodle plugin directory	0s
	59m 25s

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