ci: Typos check does not understand `concat!("hex-string")`

typos-check here: https://github.com/RustCrypto/RSA/commit/1e21564801803af8f8944f1e40a89178bb08a4fc

```
Warning: "ba" should be "by" or "be".

error: ba should be by, be
--> ./src/pkcs1v15/encrypting_key.rs:54:20

|

54 | "92ba5fe2430203010001",
```

I've had to disable it in #562 as it doesn't seem to understand macros.
