[Dependabot] Update phpunit/phpunit requirement from 9.6.21 to 9.6.22 #2312

Job	Run time
Composer Validate (8.3)	11s
PHP Lint (7.3)	11s
PHP Lint (7.4)	9s
PHP Lint (8.0)	8s
PHP Lint (8.1)	6s
PHP Lint (8.2)	9s
PHP Lint (8.3)	8s
PHP Lint (8.4)	9s
Static Analysis (composer:normalize, 8.3)	28s
Unit tests (7.3, lowest)	14s
Static Analysis (php:fixer, 8.3)	22s
Unit tests (7.3, highest)	17s
Static Analysis (php:md, 8.3)	22s
Unit tests (7.4, lowest)	22s
Static Analysis (php:rector, 8.3)	27s
Unit tests (7.4, highest)	16s
Static Analysis (php:stan, 8.3)	26s
Unit tests (8.0, lowest)	16s
Unit tests (8.0, highest)	14s
Unit tests (8.1, lowest)	18s
Unit tests (8.1, highest)	14s
Unit tests (8.2, lowest)	15s
Unit tests (8.2, highest)	15s
Unit tests (8.3, lowest)	22s
Unit tests (8.3, highest)	18s
Unit tests (8.4, lowest)	16s
Unit tests (8.4, highest)	20s
	7m 13s

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