add php 8.2 test environment and add support note in readme on php8.2… #184

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	3m 51s
test (8.1, MOODLE_401_STABLE, mariadb, false)	3m 47s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 0s
test (8.1, MOODLE_402_STABLE, mariadb, false)	4m 8s
test (8.1, MOODLE_403_STABLE, pgsql, false)	3m 27s
test (8.1, MOODLE_403_STABLE, mariadb, false)	3m 28s
test (8.2, MOODLE_402_STABLE, pgsql, false)	2m 53s
test (8.2, MOODLE_402_STABLE, mariadb, false)	2m 59s
test (8.2, MOODLE_403_STABLE, pgsql, false)	3m 24s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 26s
	34m 23s

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