minor #12363 [Maintenance] Run test suite for MySQL 8.0 (lchrusciel, GSadee)
minor #12363 [Maintenance] Run test suite for MySQL 8.0 (lchrusciel, GSadee)

This PR was merged into the 1.8 branch.

Discussion
----------

| Q               | A
| --------------- | -----
| Branch?         | master
| Bug fix?        | no
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | no
| Related tickets | 
| License         | MIT

<!--
 - Bug fixes must be submitted against the 1.7 or 1.8 branch (the lowest possible)
 - Features and deprecations must be submitted against the master branch
 - Make sure that the correct base branch is set

 To be sure you are not breaking any Backward Compatibilities, check the documentation:
 https://docs.sylius.com/en/latest/book/organization/backward-compatibility-promise.html
-->


Commits
-------

85343b1da3187268dd5525da3d883767033ab09e [Maintenance] Run test suite for MySQL 8.0
7fcf7867171b46572fcc9b16b6bfd267d00bfc5b Exclude builds for PHP 7.3 and MYSQL 8

Sylius/Sylius,Arminek/Sylius,SyliusBot/Sylius,antonioperic/Sylius,lchrusciel/Sylius,diimpp/Sylius,antonioperic/Sylius,lchrusciel/Sylius,lchrusciel/Sylius,antonioperic/Sylius,101medialab/Sylius,loic425/Sylius,Sylius/Sylius,101medialab/Sylius,GSadee/Sylius,Sylius/Sylius,SyliusBot/Sylius,Zales0123/Sylius,pamil/Sylius,SyliusBot/Sylius,pamil/Sylius,Zales0123/Sylius,GSadee/Sylius,Zales0123/Sylius,loic425/Sylius,pamil/Sylius,Arminek/Sylius,diimpp/Sylius,diimpp/Sylius,101medialab/Sylius,Arminek/Sylius,GSadee/Sylius,loic425/Sylius