Collect coverage only once per Selenium Server version (#402) #227

Job	Run time
Static analysis	17s
Check composer.json	11s
Tests (PHP 7.2, Selenium 2.53.1)	1m 27s
Tests (PHP 7.3, Selenium 2.53.1)	1m 29s
Tests (PHP 7.4, Selenium 2.53.1)	1m 40s
Tests (PHP 8.0, Selenium 2.53.1)	1m 37s
Tests (PHP 8.1, Selenium 2.53.1)	1m 37s
Tests (PHP 8.2, Selenium 2.53.1)	1m 34s
Tests (PHP 8.3, Selenium 2.53.1) with coverage	1m 34s
Tests (PHP 8.3, Selenium 3.141.59) with coverage	1m 53s
	13m 19s

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