Update discv5 (#3171)

## Issue Addressed

Updates discv5

Pending on
- [x] #3547 
- [x] Alex upgrades his deps

## Proposed Changes

updates discv5 and the enr crate. The only relevant change would be some clear indications of ipv4 usage in lighthouse

## Additional Info

Functionally, this should be equivalent to the prev version.
As draft pending a discv5 release

crypto/eth2_hashing/Cargo.toml

@@ -10,7 +10,7 @@ description = "Hashing primitives used in Ethereum 2.0"
 lazy_static = { version = "1.4.0", optional = true }
 cpufeatures = { version = "0.2.5", optional = true }
 ring = "0.16.19"
-sha2 = "0.10.2"
+sha2 = "0.10"
 
 [dev-dependencies]
 rustc-hex = "2.1.0"

crypto/eth2_key_derivation/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-sha2 = "0.9.1"
+sha2 = "0.10"
 zeroize = { version = "1.4.2", features = ["zeroize_derive"] }
 num-bigint-dig = { version = "0.6.0", features = ["zeroize"] }
 ring = "0.16.19"

crypto/eth2_keystore/Cargo.toml

@@ -11,7 +11,7 @@ rand = "0.8.5"
 hmac = "0.11.0"
 pbkdf2 = { version = "0.8.0", default-features = false }
 scrypt = { version = "0.7.0", default-features = false }
-sha2 = "0.9.1"
+sha2 = "0.9.2"
 uuid = { version = "0.8.1", features = ["serde", "v4"] }
 zeroize = { version = "1.4.2", features = ["zeroize_derive"] }
 serde = "1.0.116"