Chore - Require positive tests on PHP 8.0, additionally test PHP 8.1

[nibra]

Summary of Changes

Drone configuration

• Require tests on PHP 8.0 to pass
• Additionally test on PHP 8.1

Testing Instructions

None

Documentation Changes Required

None

[r-martins]

I may be testing in a different way from you guys, but using PHPCompatibility tests on tag 2.0.0 fails even for PHP 7.4.

$ phpcs -p ./src --standard=PHPCompatibility --runtime-set testVersion 7.4

E...W...................EE 26 / 26 (100%)



FILE: /Users/martins/temporarios/joomla-string/src/Normalise.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 9 | ERROR | 'string' is a reserved keyword as of PHP version 7.0 and should not be used to name a class, interface or trait or as part of a namespace (T_NAMESPACE)
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FILE: /Users/martins/temporarios/joomla-string/src/phputf8/utf8.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 45 | WARNING | INI directive 'mbstring.func_overload' is deprecated since PHP 7.2
-----------------------------------------------------------------------------------


FILE: /Users/martins/temporarios/joomla-string/src/StringHelper.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 9 | ERROR | 'string' is a reserved keyword as of PHP version 7.0 and should not be used to name a class, interface or trait or as part of a namespace (T_NAMESPACE)
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FILE: /Users/martins/temporarios/joomla-string/src/Inflector.php
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FOUND 1 ERROR AFFECTING 1 LINE
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
 9 | ERROR | 'string' is a reserved keyword as of PHP version 7.0 and should not be used to name a class, interface or trait or as part of a namespace (T_NAMESPACE)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------

Time: 766ms; Memory: 8MB