Switch back to using PECL for PHP 8.x and remove Pickle. #172

Job	Run time
Check for uncommitted changes	11s
PHP 7.2 Image	3m 59s
PHP 7.3 Image	3m 48s
PHP 7.4 Image	3m 35s
PHP 8.0 Image	3m 43s
PHP 8.1 Image	3m 52s
PHP 8.2 Image	4m 5s
PHP 8.3 Image	4m 26s
PHP 8.4 Image	3m 31s
PHPUnit on PHP 7.2	19s
CLI on PHP 7.2	22s
PHPUnit on PHP 7.3	24s
PHPUnit 8-php-7.2	18s
CLI on PHP 7.3	27s
PHPUnit on PHP 7.4	19s
PHPUnit 7-php-7.2	30s
CLI on PHP 7.4	23s
PHPUnit on PHP 8.0	19s
CLI on PHP 8.0	27s
PHPUnit 6-php-7.2	19s
PHPUnit on PHP 8.1	21s
CLI on PHP 8.1	25s
PHPUnit 9-php-7.3	19s
PHPUnit on PHP 8.2	17s
CLI on PHP 8.2	28s
PHPUnit 8-php-7.3	22s
PHPUnit on PHP 8.3	25s
CLI on PHP 8.3	38s
PHPUnit 7-php-7.3	22s
PHPUnit on PHP 8.4	18s
CLI on PHP 8.4	38s
PHPUnit 6-php-7.3	21s
PHPUnit 9-php-7.4	27s
PHPUnit 8-php-7.4	19s
PHPUnit 7-php-7.4	23s
PHPUnit 9-php-8.0	20s
PHPUnit 8-php-8.0	23s
PHPUnit 9-php-8.1	16s
PHPUnit 8-php-8.1	21s
PHPUnit 9-php-8.2	16s
PHPUnit 8-php-8.2	17s
PHPUnit 9-php-8.3	24s
	43m 37s

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