With PhpUnit 10 came the ability to use Php attributes rather than doc-block annotations for things like "data provider". PhpUnit 11 deprecates the use of annotations, and PhpUnit 12 will not not permit their use. Since PhpUnit 11 requires Php8.2+, we cannot adopt it as long as we support Php8.1, which will continue to be the case for some time. However, there is no penalty for early adoption.
Php-cs-fixer can use:
```
'php_unit_attributes' => ['keep_annotations' => false],
```
This allows us to run `composer fix` to automate all the needed changes. No manual changes were needed for any of the test members.
With this change, PhpUnit 9 can no longer be used with the test suite. File composer.json is updated to reflect that reality, and phpunit9.xml.dist, which has been supplied in case anyone needed to use PhpUnit 9, is no longer required, and is thus deleted. For now, PhpUnit 11 is not being added as a possibility.
No source code is changed in this PR.
Fix#3782. A signature of the ReflectionMethod constructor will be deprecated, and PhpSpreadsheet runs afoul of that change in one place. Php8.4 is not yet available in any form, and I am reluctant to make this change until we see that the issue is real (and that this PR fixes it), so am leaving this PR in draft status till then.
I note that one Excel function `PI` is implemented not as a class method in PhpSpreadsheet, but rather as a call to the native Php function `pi`. The ReflectionMethod call is subject to a TypeError in the changed code, but that is already the case. We haven't seen a TypeError because (a) it will arise only if the caller supplies an argument to the function (which must be called with zero arguments), and (b) there are no test cases for that function. The code is slightly cleaned up, and test cases are now added. This is not an important enough problem to rush this PR - the existing code (and the changed code), rather than failing with TypeError, will fail with a CalculationException (wrong number of arguments) before it gets to the TypeError; that is the correct behavior.
oleibman