Update to PHP 8.x

Support for PHP 8.x (#8)

* update to php8 compatibility

* update CI php versions

* set dev stability for propel/propel1 only

* update phpunit to resolve php8.1 incompatibility

* update github to ubuntu-20.04

* split create/grant user

* fix tests after propelbundle update

* ubuntu-22.04

* update actions/checkout and actions/cache to v3

* use dayspring-tech propel packages

* update to PropelBundle-1.8.0-BETA2

* try without setting propel.path

* update propel.path

* update to propel-bundle 1.8.0 stable

Co-authored-by: Jeffrey Wong <jwong@dayspringpartners.com>