https://github.com/sigp/lighthouse/issues/8756
Only the Web3Signer actually needs OpenSSL in order to parse PKCS12 certificates. This updates the function to instead manually parse the cert (using the `p12-keystore` crate) and converts it to a `PEM` certificate (using the `pem` crate) which can be directly converted to a `reqwest::tls::Identity` as this can be done directly in `rustls`.
Co-Authored-By: Mac L <mjladson@pm.me>
#8547
This unifies the following `crypto` dependencies to a single version each:
- `sha2`
- `hmac`
- `pbkdf2`
- `aes`
- `cipher`
- `ctr`
- `scrypt`
- `digest`
Co-Authored-By: Mac L <mjladson@pm.me>
