Deprecate MariaDB 10.4 and MySQL 5.7 support

[derrabus]

Q	A
Type	improvement
Fixed issues	N/A

Summary

Let's not carry support for the following old releases over into the next major.

• MariaDB 10.4 will be EOL three months from now.
• MySQL 5.7 is EOL since October 2023.

[alexislefebvre]

I had a deprecation message with a link to this PR with this config in phpunit.xml.dist:

<env name="DATABASE_URL" value="mysql://root:@mysql:3306/truebadges?serverVersion=8.0" />

Changing 8.0 to 8.0.0 or 8.0.39 removed the message.

This is due to this line:

dbal/src/Driver/AbstractMySQLDriver.php

Line 66 in c91166a

if (version_compare($version, '8.0.0', '>=')) {

and how PHP compare versions: https://3v4l.org/PLDVi

[derrabus]

8.0 is not a valid MySQL version while 8.0.39 is.

dbal/docs/en/reference/configuration.rst

Lines 363 to 383 in 6428f1a

	You can also pass the ``serverVersion`` option if you want to disable automatic
	database platform detection and choose the platform version implementation explicitly.
	Please specify the full server version as the database server would report it.
	This is especially important for MySQL and MariaDB where the full version
	string is taken into account when determining the platform.
	MySQL
	^^^^^
	Connect to your MySQL server and run the ``SELECT VERSION()`` query::
	mysql> SELECT VERSION();
	+-----------+
	| VERSION() |
	+-----------+
	| 8.0.32 |
	+-----------+
	1 row in set (0.00 sec)
	In the example above, ``8.0.32`` is the correct value for ``serverVersion``.