In e2e tests, set the PHP version to 8.1

[kienstra]

Changes

• In e2e tests, set the PHP version to 8.1
• Gives us a little more confidence in 8.1 compat, but e2e tests usually won't fail from PHP notices

Testing instructions

Not needed, a sanity check would be great!

[kienstra]

The e2e tests pass with PHP 8.1, though there are some PHP deprecation notices:

Starting d063fb1047aac1fd2147665b3d54e584_mysql_1 ... 
Starting d063fb1047aac1fd2147665b3d54e584_mysql_1 ... doneStarting d063fb1047aac1fd2147665b3d54e584_wordpress_1 ... 
Starting d063fb1047aac1fd2147665b3d54e584_wordpress_1 ... done^@^@[22-Apr-2022 16:47:41 UTC] PHP Deprecated:  Return type of Genesis\CustomBlocks\Blocks\Controls\ControlAbstract::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/wp-content/plugins/project/php/Blocks/Controls/ControlAbstract.php on line 137
Deprecated: Return type of Genesis\CustomBlocks\Blocks\Controls\ControlAbstract::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/wp-content/plugins/project/php/Blocks/Controls/ControlAbstract.php on line 137
[22-Apr-2022 16:47:41 UTC] PHP Deprecated:  Constant FILTER_SANITIZE_STRING is deprecated in /var/www/html/wp-content/plugins/project/php/Blocks/Loader.php on line 545
Deprecated: Constant FILTER_SANITIZE_STRING is deprecated in /var/www/html/wp-content/plugins/project/php/Blocks/Loader.php on line 545

There are several uses of FILTER_SANITIZE_STRING that I'll have to replace, that should take less than a day.

[kienstra]

It's probably going to be too much trouble to run PHPUnit tests on PHP 8.0 and 8.1.

We'd have to change the test setup.

[kienstra]

@dreamwhisper, thanks, you're a hero!