utils/backtrace: enable strict typing #27129

Job	Run time
syntax	49s
tap syntax	4m 57s
cask audit	2m 27s
formula audit	6m 9s
docker	4m 29s
update-test (Ubuntu 22.04)	1m 5s
tests (online)	8m 35s
update-test (macOS 13)	52s
test default formula (Ubuntu 22.04)	4m 21s
tests (generic OS)	5m 49s
vendored gems	45s
test default formula (Ubuntu 20.04)	5m 38s
tests (Ubuntu 22.04)	6m 18s
test default formula (macOS 13 x86_64)	2m 25s
tests (Ubuntu 20.04)	6m 57s
test default formula (macOS 14 arm64)	1m 26s
tests (macOS 13 x86_64)	7m 6s
tests (macOS 14 arm64)	11m 45s
	1h 21m 53s

Provide feedback