add php 8.2 test environment and add support note in readme on php8.2… #185

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	3m 39s
test (8.1, MOODLE_401_STABLE, mariadb, false)	3m 32s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 8s
test (8.1, MOODLE_402_STABLE, mariadb, false)	2m 52s
test (8.1, MOODLE_403_STABLE, pgsql, false)	3m 33s
test (8.1, MOODLE_403_STABLE, mariadb, false)	3m 26s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 3s
test (8.2, MOODLE_402_STABLE, mariadb, false)	2m 56s
test (8.2, MOODLE_403_STABLE, pgsql, false)	3m 19s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 23s
	32m 51s

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