Enable strict typing in `CLI::Parser` #26944

Job	Run time
syntax	46s
vendored gems	42s
cask audit	2m 26s
tap syntax	4m 36s
formula audit	6m 4s
update-test (Ubuntu 22.04)	1m 1s
update-test (macOS 13)	52s
docker	4m 11s
test default formula (Ubuntu 22.04)	4m 3s
test default formula (Ubuntu 20.04)	5m 16s
test default formula (macOS 13 x86_64)	2m 23s
tests (online)	7m 31s
test default formula (macOS 14 arm64)	1m 15s
tests (generic OS)	5m 33s
tests (Ubuntu 22.04)	6m 0s
tests (Ubuntu 20.04)	7m 47s
tests (macOS 13 x86_64)	6m 18s
tests (macOS 14 arm64)	13m 26s
	1h 20m 10s

Provide feedback