Add system dependency upgrade to 0.7 to 1.0 migration guide

[schrej]

Some system dependencies, like mariadb, might require upgrades for 1.0 to work.

[TekExplorer]

Placing some sources here in case I or someone else gets around to doing this. https://mariadb.com/kb/en/upgrading/ https://pterodox.com/guides/update-php.html

[legit1337x]

Pterodactyl