Remove OpenStruct from CLI::Args #31597

Job	Run time
syntax	45s
syntax	45s
cask audit	3m 0s
cask audit	3m 0s
tap syntax	7m 40s
tap syntax	7m 40s
formula audit	5m 19s
formula audit	5m 19s
tests (online)	9m 1s
tests (online)	5m 28s
update-test (Ubuntu)	23s
update-test (Ubuntu)	23s
tests (generic OS)	3m 15s
tests (generic OS)	3m 15s
update-test (macOS)	25s
update-test (macOS)	25s
tests (Ubuntu 24.04)	3m 0s
tests (Ubuntu 24.04)	3m 0s
test default formula (Ubuntu 22.04)	1m 25s
test default formula (Ubuntu 22.04)	1m 25s
tests (Ubuntu 22.04)	2m 51s
tests (Ubuntu 22.04)	2m 51s
test default formula (Ubuntu 20.04)	2m 45s
test default formula (Ubuntu 20.04)	2m 45s
tests (Ubuntu 20.04)	4m 11s
tests (Ubuntu 20.04)	4m 11s
test default formula (macOS 13 x86_64)	4m 36s
test default formula (macOS 13 x86_64)	4m 36s
vendored gems	42s
vendored gems	42s
tests (macOS 13 x86_64)	9m 4s
tests (macOS 13 x86_64)	10m 13s
test default formula (macOS 15 arm64)	1m 20s
test default formula (macOS 15 arm64)	1m 20s
tests (macOS 15 arm64)	5m 36s
tests (macOS 15 arm64)	5m 36s
	2h 8m 12s

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