Merge upstream, inherit community improvements

[SteelWagstaff]

Merged up to https://github.com/roots/trellis/commit/ecc902305ff9a00d97c8565e72a14be3915fe79e.

Partial fix for https://github.com/pressbooks/trellis/issues/27

Notes

Trellis now officially supports/uses Ubuntu 20.04, PHP 7.4, Ansible 2.9, MariaDB 10.5, and Composer 2.0. Updating to some of these will require manual action in addition to reprovisioning the server.

Full commit history since last time we updated: https://github.com/roots/trellis/compare/1.3.0...master

Notable changes

• Update PHP to 7.4: https://github.com/roots/trellis/pull/1164
• Support Ubuntu 20.04 (and use as default Vagrant image): https://github.com/roots/trellis/pull/1197
• Support Ansible 2.9: https://github.com/roots/trellis/pull/1169
• Update MariaDB to 10.5: https://github.com/roots/trellis/pull/1212 (does not upgrade MariaDB version installed for existing installs without specific action)
• Update WP-cli version to 2.4: https://github.com/roots/trellis/pull/1131
• Remove prestissimo composer plugin: https://github.com/roots/trellis/pull/1247 (should be coordinated with Composer 2.0 update)
• Use official Nginx package: https://github.com/roots/trellis/pull/1208 (needs manual intervention to implement change)
• Use modern SSL config for Nginx: https://github.com/roots/trellis/pull/1127
• Remove nginx_includes_deprecated feature: https://github.com/roots/trellis/pull/1173 (potential breaking change)
• Support branch variable for deploys: https://github.com/roots/trellis/pull/1204
• Add config for PHP CLI: https://github.com/roots/trellis/pull/1261
• Allow WP cron minute/interval to be configurable: https://github.com/roots/trellis/pull/1222
• Make Fail2ban settings extensible: https://github.com/roots/trellis/pull/1177
• Sets new defaults for Composer install settings during deploys: https://github.com/roots/trellis/pull/1133 + https://github.com/roots/trellis/pull/1132