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Bump `ctutils` to v0.4.5; MSRV 1.87 #2791

Job	Run time
build (stable, wasm32-unknown-unknown)	29s
build (stable, thumbv7em-none-eabi)	28s
test (stable)	29s
build (1.87.0, wasm32-unknown-unknown)	30s
test (1.87.0)	29s
build (1.87.0, thumbv7em-none-eabi)	26s
minimal-versions	-1s
	2m 50s