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.

Cargo.lock

@@ -2935,6 +2935,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bee0328b1209d157ef001c94dd85b4f8f64139adb0eac2659f4b08382b2f474d"
 dependencies = [
  "cfg-if 1.0.0",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
 ]
 
 [[package]]
@@ -6320,13 +6323,14 @@ dependencies = [
 
 [[package]]
 name = "tiny-bip39"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9e44c4759bae7f1032e286a7ef990bd9ed23fe831b7eeba0beb97484c2e59b8"
+checksum = "524daa5624d9d4ffb5a0625971d35205b882111daa6b6338a7a6c578a3c36928"
 dependencies = [
  "anyhow",
  "hmac 0.8.1",
  "once_cell",
+ "parking_lot",
  "pbkdf2 0.4.0",
  "rand 0.7.3",
  "rustc-hash",
@@ -7443,18 +7447,18 @@ dependencies = [
 
 [[package]]
 name = "zeroize"
-version = "1.4.1"
+version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "377db0846015f7ae377174787dd452e1c5f5a9050bc6f954911d01f116daa0cd"
+checksum = "bf68b08513768deaa790264a7fac27a58cbf2705cfcdc9448362229217d7e970"
 dependencies = [
  "zeroize_derive",
 ]
 
 [[package]]
 name = "zeroize_derive"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2c1e130bebaeab2f23886bf9acbaca14b092408c452543c857f66399cd6dab1"
+checksum = "bdff2024a851a322b08f179173ae2ba620445aef1e838f0c196820eade4ae0c7"
 dependencies = [
  "proc-macro2",
  "quote",