GH Actions: switch to Coveralls action runner to upload reports #433

Job	Run time
Test: PHP 5.5 - PHPCS lowest	29s
Test + Lint: PHP 5.5 - PHPCS dev-master	20s
Test: PHP 5.6 - PHPCS lowest	16s
Test + Lint: PHP 5.6 - PHPCS dev-master	21s
Test: PHP 7.0 - PHPCS lowest	16s
Test + Lint: PHP 7.0 - PHPCS dev-master	20s
Test: PHP 7.1 - PHPCS lowest	13s
Test + Lint: PHP 7.1 - PHPCS dev-master	20s
Test: PHP 7.2 - PHPCS lowest	17s
Test + Lint: PHP 7.2 - PHPCS dev-master	17s
Test: PHP 7.3 - PHPCS lowest	23s
Test + Lint: PHP 7.3 - PHPCS dev-master	15s
Test: PHP 8.0 - PHPCS lowest	13s
Test + Lint: PHP 8.0 - PHPCS dev-master	14s
Test: PHP 8.1 - PHPCS lowest	13s
Test + Lint: PHP 8.1 - PHPCS dev-master	25s
Test: PHP 8.2 - PHPCS lowest	21s
Test + Lint: PHP 8.2 - PHPCS dev-master	22s
Test: PHP 8.3 - PHPCS lowest	33s
Test + Lint: PHP 8.3 - PHPCS dev-master	31s
Coverage: PHP 5.4 - PHPCS lowest	1m 12s
Coverage + Lint: PHP 5.4 - PHPCS dev-master	54s
Coverage: PHP 7.4 - PHPCS lowest	28s
Coverage + Lint: PHP 7.4 - PHPCS dev-master	32s
coveralls-finish	3s
	9m 48s

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