Update zeroize_derive (#2625)

## Issue Addressed

NA

## Proposed Changes

As `cargo audit` astutely pointed out, the version of `zeroize_derive` were were using had a vulnerability:

```
Crate:         zeroize_derive
Version:       1.1.0
Title:         `#[zeroize(drop)]` doesn't implement `Drop` for `enum`s
Date:          2021-09-24
ID:            RUSTSEC-2021-0115
URL:           https://rustsec.org/advisories/RUSTSEC-2021-0115
Solution:      Upgrade to >=1.2.0
```

This PR updates `zeroize` and `zeroize_derive` to appease `cargo audit`.

`tiny-bip39` was also updated to allow compile.

## Additional Info

I don't believe this vulnerability actually affected the Lighthouse code-base directly. However, `tiny-bip39` may have been affected which may have resulted in some uncleaned memory in Lighthouse. Whilst this is not ideal, it's not a major issue. Zeroization is a nice-to-have since it only protects from sophisticated attacks or attackers that already have a high level of access already.

crypto/bls/Cargo.toml

@@ -16,7 +16,7 @@ hex = "0.4.2"
 eth2_hashing = "0.2.0"
 ethereum-types = "0.11.0"
 arbitrary = { version = "0.4.6", features = ["derive"], optional = true }
-zeroize = { version = "1.1.1", features = ["zeroize_derive"] }
+zeroize = { version = "1.4.2", features = ["zeroize_derive"] }
 blst = "0.3.3"
 
 [features]

crypto/eth2_key_derivation/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 
 [dependencies]
 sha2 = "0.9.1"
-zeroize = { version = "1.1.1", features = ["zeroize_derive"] }
+zeroize = { version = "1.4.2", features = ["zeroize_derive"] }
 num-bigint-dig = { version = "0.6.0", features = ["zeroize"] }
 ring = "0.16.19"
 bls = { path = "../bls" }

crypto/eth2_keystore/Cargo.toml

@@ -13,7 +13,7 @@ pbkdf2 = { version = "0.8.0", default-features = false }
 scrypt = { version = "0.7.0", default-features = false }
 sha2 = "0.9.1"
 uuid = { version = "0.8.1", features = ["serde", "v4"] }
-zeroize = { version = "1.1.1", features = ["zeroize_derive"] }
+zeroize = { version = "1.4.2", features = ["zeroize_derive"] }
 serde = "1.0.116"
 serde_repr = "0.1.6"
 hex = "0.4.2"

crypto/eth2_wallet/Cargo.toml

@@ -14,7 +14,7 @@ uuid = { version = "0.8.1", features = ["serde", "v4"] }
 rand = "0.7.3"
 eth2_keystore = { path = "../eth2_keystore" }
 eth2_key_derivation = { path = "../eth2_key_derivation" }
-tiny-bip39 = "0.8.0"
+tiny-bip39 = "0.8.1"
 
 [dev-dependencies]
 hex = "0.4.2"