* How can I force `stm32h7xx-hal` to use `synopsys-usb-otg = ^0.4`? it keeps flipping and resolving to 0.2.9

The reason is it is gated as https://github.com/stm32-rs/stm32h7xx-hal/blob/master/Cargo.toml#L44 behind this feature

```
usb_hs = ["synopsys-usb-otg", "synopsys-usb-otg/hs"]
```

and that resolves my lockfile as 

```
[[package]]
name = "stm32h7xx-hal"
version = "0.15.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e08bcfbdbe4458133f2fd55994a5c4f1b4bf28084f0218e93cdbc19d7c70219f"
dependencies = [
 "bare-metal 1.0.0",
 "cast",
 "chrono",
 "cortex-m",
 "embedded-dma",
 "embedded-hal",
 "embedded-storage",
 "fugit",
 "nb 1.1.0",
 "paste",
 "stm32h7",
 "synopsys-usb-otg 0.3.2",
 "void",
]
```