Tests

Remove obsolete `symfony/polyfill-php80` and `symfony/polyfill-php81`… #2929

Job	Run time
PHPUnit tests (ubuntu-20.04, 8.1, 4.4, server)	4m 26s
PHPUnit tests (ubuntu-20.04, 8.2, 4.4, server)	4m 33s
PHPUnit tests (ubuntu-20.04, 8.3, 4.4, server)	4m 26s
PHPUnit tests (ubuntu-20.04, 8.4, 4.4, server)	3m 50s
PHPUnit tests (ubuntu-20.04, 8.1, 6.0, replica_set)	5m 17s
PHPUnit tests (ubuntu-20.04, 8.1, 6.0, sharded_cluster)	9m 53s
PHPUnit tests (ubuntu-20.04, 8.1, 5.0, server)	4m 30s
PHPUnit tests (ubuntu-20.04, 8.1, 4.4, replica_set)	5m 9s
PHPUnit tests (ubuntu-20.04, 8.1, 4.4, sharded_cluster)	7m 23s
	49m 27s

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