deserialize rentEpoch issues

affects getblock.io endpoints

```rust
ok: Rpc(Error { request: None, kind: SerdeJson(Error("invalid type: floating point `1.8446744073709552e19`, expected u64", line: 0, column: 0)) })
```

solana rust client cannot deserialize bad account values see:
upstream issue: https://github.com/anza-xyz/agave/issues/2950

easiest way to fix is to patch the solana-client crate (inside drift-rs)