fix(deps): update rust crate cortex-m-rt to 0.7.4 - autoclosed

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cortex-m-rt	dependencies	patch	0.7.3 -> 0.7.4

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Release Notes

rust-embedded/cortex-m (cortex-m-rt)

v0.7.4

Compare Source

v0.7.4 - 2021-12-31

Added

• Added support for additional DWT counters (#​349)
  • CPI counter
  • Exception overhead counter
  • LSU counter
  • Folded-instruction counter
• Added DWT.set_cycle_count (#​347).
• Added support for the Cortex-M7 TCM and cache access control registers.
  There is a feature cm7 to enable access to these (#​352).
• Add derives for serde, Hash, and PartialOrd to VectActive behind feature
  gates for host-platform use (#​363).
• Support host platforms besides x86_64 (#​369).
• Added delay::Delay::with_source, a constructor that lets you specify
  the SysTick clock source (#​374).

Fixed

• Fix incorrect AIRCR PRIGROUP mask (#​338, #​339).
• Fix nightly users of inline-asm breaking now that the asm macro is removed
  from the prelude (#​372).

Deprecated

• DWT::get_cycle_count has been deprecated in favor of DWT::cycle_count.
  This change was made for consistency with the C-GETTER convention. (#​349)

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