Update workflow configuration to remove master #600

Job	Run time
test / check if job needs to run	9s
test / check if job needs to run	10s
test / prepare test matrix	10s
test / prepare test matrix	16s
test / master - pgsql - php 8.0 - tool_mfa	1m 24s
test / MOODLE_400_STABLE - pgsql - php 7.3 - tool_mfa	4m 18s
test / MOODLE_400_STABLE - pgsql - php 7.3 - tool_mfa	5m 58s
test / MOODLE_401_STABLE - pgsql - php 7.4 - tool_mfa	5m 47s
test / MOODLE_401_STABLE - pgsql - php 7.4 - tool_mfa	4m 21s
test / MOODLE_401_STABLE - mariadb - php 7.4 - tool_mfa	5m 43s
test / MOODLE_401_STABLE - mariadb - php 7.4 - tool_mfa	4m 17s
test / MOODLE_401_STABLE - mariadb - php 8.0 - tool_mfa	6m 7s
test / MOODLE_401_STABLE - mariadb - php 8.0 - tool_mfa	4m 42s
test / MOODLE_401_STABLE - pgsql - php 8.0 - tool_mfa	4m 48s
test / MOODLE_401_STABLE - pgsql - php 8.0 - tool_mfa	5m 3s
test / Release to the Moodle plugin directory	0s
test / Release to the Moodle plugin directory	0s
test / MOODLE_402_STABLE - pgsql - php 8.0 - tool_mfa	4m 41s
test / MOODLE_402_STABLE - mariadb - php 8.0 - tool_mfa	2m 51s
test / MOODLE_402_STABLE - pgsql - php 8.1 - tool_mfa	4m 11s
test / MOODLE_402_STABLE - mariadb - php 8.1 - tool_mfa	1m 44s
	1h 6m 40s

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