Test

Improve interior mutability slide #4538

Job	Run time
cargo (ubuntu-latest)	25s
bare-metal (src/bare-metal/alloc-example, aarch64-unknown-none)	20s
cargo (macos-latest)	49s
bare-metal (src/bare-metal/aps/examples, aarch64-unknown-none)	24s
bare-metal (src/bare-metal/microcontrollers/examples, thumbv7em-none-eabihf)	40s
find-languages	3s
bare-metal (src/exercises/bare-metal/compass, thumbv7em-none-eabihf)	2m 4s
bare-metal (src/exercises/bare-metal/rtc, aarch64-unknown-none)	22s
format	36s
build (bn)	2m 48s
build (da)	3m 21s
build (de)	2m 36s
build (el)	2m 40s
build (en)	2m 40s
build (es)	2m 23s
build (fa)	2m 29s
build (fr)	3m 24s
build (id)	2m 28s
build (it)	2m 31s
build (ja)	2m 43s
build (ko)	2m 33s
build (pl)	2m 35s
build (pt-BR)	2m 39s
build (ro)	5m 1s
build (ru)	2m 25s
build (tr)	2m 25s
build (uk)	2m 46s
build (zh-CN)	2m 36s
build (zh-TW)	2m 33s
	1h 1m 19s

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