Merge pull request #678 from wp-cli/upgrade-ubuntu-version #396

Job	Run time
Build Phar	42s
Functional - WP latest on PHP 7.2 with MySQL 8.0	4m 44s
Functional - WP latest on PHP 7.3 with MySQL 8.0	4m 39s
Functional - WP latest on PHP 7.4 with MySQL 8.0	4m 39s
Functional - WP latest on PHP 8.0 with MySQL 8.0	5m 9s
Functional - WP trunk on PHP 7.2 with MySQL 8.0	4m 48s
Functional - WP trunk on PHP 7.2 with MySQL 5.7	5m 22s
Functional - WP trunk on PHP 7.2 with MySQL 5.6	5m 13s
Functional - WP trunk on PHP 7.4 with MySQL 8.0	4m 37s
Functional - WP trunk on PHP 8.0 with MySQL 8.0	4m 35s
Functional - WP trunk on PHP 8.0 with MySQL 5.7	5m 13s
Functional - WP trunk on PHP 8.0 with MySQL 5.6	5m 11s
Functional - WP 3.7 on PHP 5.6 with MySQL 5.6	5m 11s
Deployment	10s
Build RPM package	0s
Build DEB package	0s
	1h 0m 13s

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