Update phpunit/phpunit requirement from ^8.5 to ^9.5

[dependabot]

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

Changelog

Sourced from phpunit/phpunit's changelog.

[9.5.5] - 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

• #4632: TestDox result printer does not handle repeated test execution correctly
• #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

[9.5.4] - 2021-03-23

Fixed

• #4630: Empty test case class causes error in TestDox XML logger

[9.5.3] - 2021-03-17

Fixed

• #4591: TeamCity logger logs warnings as test failures
• #4620: No useful output when an error occurs in the bootstrap script

[9.5.2] - 2021-02-02

Fixed

• #4573: No stack trace printed when PHPUnit is used from PHAR
• #4590: --coverage-text CLI option is documented wrong

[9.5.1] - 2021-01-17

Fixed

• #4572: Schema validation does not work with %xx sequences in path to phpunit.xsd

[9.5.0] - 2020-12-04

Changed

• #4490: Emit Error instead of Warning when test case class cannot be instantiated
• #4491: Emit Error instead of Warning when data provider does not work correctly
• #4492: Emit Error instead of Warning when test double configuration is invalid
• #4493: Emit error when (configured) test directory does not exist

Fixed

... (truncated)

Commits

• 89ff45e Prepare release
• 4e4c9e6 Merge branch '8.5' into 9.5
• cc66f2f Prepare release
• 6358d30 Merge branch '8.5' into 9.5
• fbfa35c Update tools
• 6a0056b Merge branch '8.5' into 9.5
• 757f003 Closes #4694
• f60f6d1 Fix CS/WS issue
• 398db60 Eliminate dead code
• a617443 Fix doc comment
• Additional commits viewable in compare view

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