Update PHP dependencies

```
Installing dependencies from lock file (including require-dev)
Package operations: 3 installs, 7 updates, 0 removals
  - Downloading nikic/php-parser (v5.1.0)
  - Downloading phpunit/phpunit (9.6.20)
  - Upgrading squizlabs/php_codesniffer (3.7.2 => 3.8.1): Extracting archive
dealerdirect/phpcodesniffer-composer-installer contains a Composer plugin which is currently not in your allow-plugins config. See https://getcomposer.org/allow-plugins
Do you trust "dealerdirect/phpcodesniffer-composer-installer" to execute code and wish to enable it now? (writes "allow-plugins" to composer.json) [y,n,d,?] y
  - Installing dealerdirect/phpcodesniffer-composer-installer (v1.0.0): Extracting archive
  - Upgrading symfony/polyfill-php80 (v1.29.0 => v1.30.0): Extracting archive
  - Installing phpcsstandards/phpcsutils (1.0.9): Extracting archive
  - Installing phpcsstandards/phpcsextra (1.1.2): Extracting archive
  - Upgrading composer/semver (3.3.2 => 3.4.0): Extracting archive
  - Upgrading mediawiki/mediawiki-codesniffer (v42.0.0 => v43.0.0): Extracting archive
  - Upgrading nikic/php-parser (v5.0.2 => v5.1.0): Extracting archive
  - Upgrading myclabs/deep-copy (1.11.1 => 1.12.0): Extracting archive
  - Upgrading phpunit/phpunit (9.6.16 => 9.6.20): Extracting archive
Generating autoload files
```
Bug: https://phabricator.wikimedia.org/T369065

tests/php/LanguageUtilTest.php

@@ -171,12 +171,12 @@ class LanguageUtilTest extends TestCase {
 
 		$this->assertEquals(
 			[
-				'atj', 'gn',  'en',
-				'es',  'fr',  'haw',
-				'ik',  'kl',  'nl',
-				'pt',  'qu',  'srn',
-				'chy', 'yi',  'chr',
-				'ike-cans',  'cr'
+				'atj', 'gn', 'en',
+				'es', 'fr', 'haw',
+				'ik', 'kl', 'nl',
+				'pt', 'qu', 'srn',
+				'chy', 'yi', 'chr',
+				'ike-cans', 'cr'
 			],
 			$sorted
 		);