build

Adds `latest` #8

Job	Run time
runner / shfmt	5s
test-multi-versions (ubuntu-latest, 0.16.2)	4s
runner / shellcheck	9s
test-multi-versions (ubuntu-latest, 0.16.3)	3s
test-on-cross-platform (ubuntu-latest, 0.16.2)	6s
test-on-cross-platform (ubuntu-latest, 0.16.3)	5s
test-parent-directory (ubuntu-latest)	3s
test-on-cross-platform (windows-latest, 0.16.2)	14s
test-parent-directory (windows-latest)	13s
test-on-cross-platform (windows-latest, 0.16.3)	14s
test-on-cross-platform (macOS-13, 0.16.2)	5s
test-parent-directory (macOS-latest)	6s
test-on-cross-platform (macOS-13, 0.16.3)	7s
test-on-cross-platform (macOS-latest, 0.16.2)	6s
test-on-cross-platform (macOS-latest, 0.16.3)	6s
	1m 46s

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