Update phpunit/phpunit requirement from ^8.5 || ^9.5 to ^8.5.18

[dependabot]

Updates the requirements on phpunit/phpunit to permit the latest version.

Changelog

Sourced from phpunit/phpunit's changelog.

[8.5.18] - 2021-07-19

Fixed

• #4720: PHPUnit does not verify its own PHP extension requirements

[8.5.17] - 2021-06-23

Changed

• PHPUnit now errors out on startup when PHP_VERSION contains a value that is not compatible with version_compare(), for instance X.Y.Z-(to be removed in future macOS)

[8.5.16] - 2021-06-05

Changed

• The test result cache (the storage for which is implemented in PHPUnit\Runner\DefaultTestResultCache) no longer uses PHP's serialize() and unserialize() functions for persistence. It now uses a versioned JSON format instead that is independent of PHP implementation details (see #3581 and #4662 for examples why this is a problem). When PHPUnit tries to load the test result cache from a file that does not exist, or from a file that does not contain data in JSON format, or from a file that contains data in a JSON format version other than the one used by the currently running PHPUnit version, then this is considered to be a "cache miss". An empty DefaultTestResultCache object is created in this case. This should also prevent PHPUnit from crashing when trying to load a test result cache file created by a different version of PHPUnit (see #4580 for example).

Fixed

• #4663: TestCase::expectError() works on PHP 7.3, but not on PHP >= 7.4
• #4678: Stubbed methods with iterable return types should return empty array by default
• #4692: Annotations in single-line doc-comments are not handled correctly
• #4694: TestCase::getMockFromWsdl() does not work with PHP 8.1-dev

[8.5.15] - 2021-03-17

Fixed

• #4591: TeamCity logger logs warnings as test failures

[8.5.14] - 2021-01-17

Fixed

• #4535: getMockFromWsdl() does not handle methods that do not have parameters correctly
• #4572: Schema validation does not work with %xx sequences in path to phpunit.xsd
• #4575: PHPUnit 8.5 incompatibility with PHP 8.1

[8.5.13] - 2020-12-01

Fixed

• Running tests in isolated processes did not work with PHP 8 on Windows

[8.5.12] - 2020-11-30

Changed

• Changed PHP version constraint in composer.json from ^7.2 to >=7.2 to allow the installation of PHPUnit 8.5 on PHP 8. Please note that the code coverage functionality is not available for PHPUnit 8.5 on PHP 8.

... (truncated)

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