v3.3.0 (#3741)

## Issue Addressed

NA

## Proposed Changes

- Bump versions
- Pin the `nethermind` version since our method of getting the latest tags on `master` is giving us an old version (`1.14.1`).
- Increase timeout for execution engine startup.

## Additional Info

- [x] ~Awaiting further testing~

testing/execution_engine_integration/src/nethermind.rs

@@ -8,7 +8,10 @@ use std::process::{Child, Command, Output};
 use tempfile::TempDir;
 use unused_port::unused_tcp_port;
 
-const NETHERMIND_BRANCH: &str = "master";
+/// We've pinned the Nethermind version since our method of using the `master` branch to
+/// find the latest tag isn't working. It appears Nethermind don't always tag on `master`.
+/// We should fix this so we always pull the latest version of Nethermind.
+const NETHERMIND_BRANCH: &str = "release/1.14.6";
 const NETHERMIND_REPO_URL: &str = "https://github.com/NethermindEth/nethermind";
 
 fn build_result(repo_dir: &Path) -> Output {

testing/execution_engine_integration/src/test_rig.rs

@@ -18,7 +18,7 @@ use types::{
     Address, ChainSpec, EthSpec, ExecutionBlockHash, ExecutionPayload, FullPayload, Hash256,
     MainnetEthSpec, PublicKeyBytes, Slot, Uint256,
 };
-const EXECUTION_ENGINE_START_TIMEOUT: Duration = Duration::from_secs(20);
+const EXECUTION_ENGINE_START_TIMEOUT: Duration = Duration::from_secs(30);
 
 struct ExecutionPair<E, T: EthSpec> {
     /// The Lighthouse `ExecutionLayer` struct, connected to the `execution_engine` via HTTP.