GH Actions: work around intermittent apt-get errors #170

Job	Run time
Test: PHP 5.4 - PHPCS 3.1.0	45s
Test + Lint: PHP 5.4 - PHPCS dev-master	36s
Test: PHP 5.5 - PHPCS 3.1.0	29s
Test + Lint: PHP 5.5 - PHPCS dev-master	55s
Test: PHP 5.6 - PHPCS 3.1.0	27s
Test + Lint: PHP 5.6 - PHPCS dev-master	38s
Test: PHP 7.0 - PHPCS 3.1.0	27s
Test + Lint: PHP 7.0 - PHPCS dev-master	44s
Test: PHP 7.1 - PHPCS 3.1.0	39s
Test + Lint: PHP 7.1 - PHPCS dev-master	34s
Test: PHP 7.2 - PHPCS 3.1.0	34s
Test + Lint: PHP 7.2 - PHPCS dev-master	35s
Test + Lint: PHP 8.3 - PHPCS dev-master	22s
Test: PHP 8.3 - PHPCS 3.8.0	21s
Test + Lint: PHP 8.2 - PHPCS dev-master	48s
Test: PHP 8.2 - PHPCS 3.6.1	52s
Test + Lint: PHP 8.1 - PHPCS dev-master	26s
Test: PHP 8.1 - PHPCS 3.6.1	25s
Test + Lint: PHP 8.0 - PHPCS dev-master	37s
Test: PHP 8.0 - PHPCS 3.5.7	27s
Test + Lint: PHP 7.4 - PHPCS dev-master	33s
Test: PHP 7.4 - PHPCS 3.5.0	32s
Test + Lint: PHP 7.3 - PHPCS dev-master	45s
Test: PHP 7.3 - PHPCS 3.3.1	34s
Test: PHP 7.4 - PHPCS 4.0.x-dev	25s
Test + Lint: PHP 8.4 - PHPCS dev-master	23s
	14m 53s

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