v1.4.0 (#2402)

## Issue Addressed

NA

## Proposed Changes

- Bump versions and update `Cargo.lock`

## Additional Info

NA

## TODO

- [x] Ensure #2398 gets merged succesfully

Cargo.lock

@@ -630,7 +630,7 @@ dependencies = [
 
 [[package]]
 name = "beacon_node"
-version = "1.4.0-rc.0"
+version = "1.4.0"
 dependencies = [
  "beacon_chain",
  "clap",
@@ -844,7 +844,7 @@ dependencies = [
 
 [[package]]
 name = "boot_node"
-version = "1.4.0-rc.0"
+version = "1.4.0"
 dependencies = [
  "beacon_node",
  "clap",
@@ -3352,7 +3352,7 @@ dependencies = [
 
 [[package]]
 name = "lcli"
-version = "1.4.0-rc.0"
+version = "1.4.0"
 dependencies = [
  "account_utils",
  "bls",
@@ -3729,7 +3729,7 @@ dependencies = [
 
 [[package]]
 name = "lighthouse"
-version = "1.4.0-rc.0"
+version = "1.4.0"
 dependencies = [
  "account_manager",
  "account_utils",