chore: replace deprecated bare-metal with critical-section
#1120
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bare_metalwas last time updated 3 years ago with a deprecation.Yet, rtic still uses
bare_metaland givesctx.csasbare_metal::CriticalSection. This is a problem because most libraries usecritical_section::CriticalSection. And for some reason no one publishedbare_metal 1.1.0, thus on crates.io the critical section of thebare_metalis a different type from that ofcritical_section.