feat: Change the default signing algorithm to SHA-512 #995

Job	Run time
Lint CS	28s
AutoReview Tests	23s
Unit Tests (PHP 8.1, locked)	27s
Unit Tests (PHP 8.1, lowest)	28s
Unit Tests (PHP 8.1, highest)	17s
Unit Tests (PHP 8.2, highest)	25s
Wait for the PHAR & Docker images	4m 36s
Unit Tests (PHP 8.3, highest, --ignore-platform-req=php+)	53s
Update the RequirementChecker	0s
End-to-End Tests (_test_e2e_pass_no_config_min_composer_php, ghcr.io/box-project/box_php725)	14s
End-to-End Tests (_test_e2e_pass_no_config_min_box_php, ghcr.io/box-project/box_php81)	25s
End-to-End Tests (_test_e2e_pass_complete_min_composer_php, ghcr.io/box-project/box_php725)	18s
End-to-End Tests (_test_e2e_pass_complete_min_box_php, ghcr.io/box-project/box_php81)	29s
End-to-End Tests (_test_e2e_fail_complete_min_composer_php, ghcr.io/box-project/box_php725)	24s
End-to-End Tests (_test_e2e_fail_complete_min_box_php, ghcr.io/box-project/box_php81)	28s
End-to-End Tests (_test_e2e_skip_min_composer_php, ghcr.io/box-project/box_php725)	20s
End-to-End Tests (_test_e2e_pass_complete_requirement_checker_not_disabled, ghcr.io/box-project/b...	21s
End-to-End Tests (_test_e2e_fail_conflict, ghcr.io/box-project/box_php81)	19s
RequirementChecker status	1s
	11m 16s

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