Update Rust crate cortex-m to 0.7.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cortex-m	dependencies	patch	0.7.4 -> 0.7.5

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Release Notes

rust-embedded/cortex-m

v0.7.5

Compare Source

Deprecated

• the ptr() function on all peripherals register blocks in favor of
  the associated constant PTR (#​386).

Changed

• The inline-asm feature no longer requires a nightly Rust compiler, but
  does require Rust 1.59 or above.

Fixed

• Fixed singleton!() statics sometimes ending up in .data instead of .bss (#​364, #​380).
  (Backported from upcoming 0.8 release).

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