bump minor version: hopefully help crates.io update the registry

[phansel]

Per my comment here, crates.io is not properly updating the dependency tree of stm32h7xx_hal, probably because the minor version of the crate is static: #440 (comment)

https://doc.rust-lang.org/cargo/reference/resolver.html may help figure out why this is the case.

As of stm32h7xx_hal = 0.14.0, the registry reads:
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<0.8","features":[],"optional":false,"default_features":true,"target":null,"kind":"dev"},{"name":"cortex-m-rtic","req":"^1.1","features":[],"optional":false,"default_features":true,"target":null,"kind":"dev"},{"name":"cortex-m-semihosting","req":"^0.5.0","features":[],"optional":false,"default_features":true,"target":null,"kind":"dev"},{"name":"defmt","req":">=0.2.0, 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This kind of thing wouldn't be observable for someone using the crate as a local package.