Bump php from 8.1.30-fpm to 8.1.31-fpm in /php/8.1 #112

Job	Run time
Build and push PHP 7.4	4m 12s
Build and push nginx	16s
Build and push PHP 8.0	4m 20s
Build and push nginx-proxy	26s
Build and push PHP 8.1	4m 36s
Build and push postfix	1m 51s
Build and push PHP 8.2	4m 49s
Build and push redis	20s
Build and push PHP 8.3	4m 50s
Build and push cron	17s
Build and push PHP stable	4m 30s
Build and push mailhog	15s
Build and push mariadb	19s
Build and push newrelic-daemon	17s
	31m 18s

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