Tests: Replace expectException() for PHP native errors with calls to the dedicated PHPUnit 8.4+ methods.

The old manner of testing these is soft deprecated as of PHPUnit 8.4, hard deprecated as of PHPUnit 9.0 and will be removed in PHPUnit 10.0.

These dedicated methods introduced in PHPUnit 8.4 should be used as an alternative:

* `expectDeprecation()`
* `expectDeprecationMessage()`
* `expectDeprecationMessageMatches()`
* `expectNotice()`
* `expectNoticeMessage()`
* `expectNoticeMessageMatches()`
* `expectWarning()`
* `expectWarningMessage()`
* `expectWarningMessageMatches()`
* `expectError()`
* `expectErrorMessage()`
* `expectErrorMessageMatches()`

These new PHPUnit methods are all polyfilled by the PHPUnit Polyfills and switching to these will future-proof the tests some more.

References:
* https://github.com/sebastianbergmann/phpunit/blob/8.4.3/ChangeLog-8.4.md#840---2019-10-04
* https://github.com/sebastianbergmann/phpunit/issues/3775

Follow-up to [51559-51562].

Props jrf.
See #46149.
Built from https://develop.svn.wordpress.org/trunk@51563


git-svn-id: http://core.svn.wordpress.org/trunk@51174 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51562';
+$wp_version = '5.9-alpha-51563';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.