dbl

Only run CI on latest commit of PR branches. #1864

Job	Run time
build (1.85.0, thumbv7em-none-eabi)	1s
build (stable, wasm32-unknown-unknown)	25s
build (1.85.0, wasm32-unknown-unknown)	1s
build (stable, thumbv7em-none-eabi)	1s
test (stable)	1s
minimal-versions / minimal-versions	25s
test (1.85.0)	1s
	55s

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