Dependency cortex-m-rt requires update due to miscompilation advisory

[Nisenogen]

The cortex-m-rt crate has reported a new regression which causes incorrect behavior at runtime for versions 0.7.1 and 0.7.2, see advisory at https://github.com/rust-embedded/cortex-m/discussions/469

The cargo lockfile of this repository is set to use the buggy version 0.7.2, which can cause miscompilation. The project's configuration file needs to be updated to require version 0.7.3 or later for this dependency to make sure all user projects are forcefully updated to a version which fixes the regression.

[Dirbaio]

fixed in 8658dc55d9ec502304a415f81174e854cd008693