chore: add cache folder to .gitignore #206

# to view logs

Job	Run time
PHP 8.1, SF 6.3.* - highest	34s
PHP 8.1, SF 6.4.* - highest	45s
PHP 8.2, SF 6.3.* - highest	38s
PHP 8.2, SF 6.4.* - highest	30s
PHP 8.2, SF 7.0.* - highest	34s
PHP 8.3, SF 6.3.* - highest	30s
PHP 8.3, SF 6.4.* - highest	43s
code-coverage / Code Coverage	31s
PHP 8.3, SF 7.0.* - highest	32s
composer-validate / Validate composer.json	11s
PHP 8.1, SF * - lowest	28s
cs / PHP Coding Standards	12s
sca / Static Code Analysis	20s
	6m 28s

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