Release tracking PR: `v0.12.0` #527

Job	Run time
Test - nightly toolchain	22s
Test - 1.56.1 toolchain	2m 17s
Test - beta toolchain	25s
Test - stable toolchain	22s
Check for changes to the public API	1m 17s
Test 32-bit version	26s
no_std no alloc	57s
no_std with alloc	52s
Cross test	1m 6s
	8m 4s

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