Upgrade dependencies (#2513)

## Proposed Changes

* Consolidate Tokio versions: everything now uses the latest v1.10.0, no more `tokio-compat`.
* Many semver-compatible changes via `cargo update`. Notably this upgrades from the yanked v0.8.0 version of crossbeam-deque which is present in v1.5.0-rc.0
* Many semver incompatible upgrades via `cargo upgrades` and `cargo upgrade --workspace pkg_name`. Notable ommissions:
    - Prometheus, to be handled separately: https://github.com/sigp/lighthouse/issues/2485
    - `rand`, `rand_xorshift`: the libsecp256k1 package requires 0.7.x, so we'll stick with that for now
    - `ethereum-types` is pinned at 0.11.0 because that's what `web3` is using and it seems nice to have just a single version
    
## Additional Info

We still have two versions of `libp2p-core` due to `discv5` depending on the v0.29.0 release rather than `master`. AFAIK it should be OK to release in this state (cc @AgeManning )

beacon_node/genesis/Cargo.toml

@@ -6,7 +6,6 @@ edition = "2018"
 
 [dev-dependencies]
 eth1_test_rig = { path = "../../testing/eth1_test_rig" }
-tokio-compat-02 = "0.2.0"
 sensitive_url = { path = "../../common/sensitive_url" }
 
 [dependencies]
@@ -20,7 +19,7 @@ merkle_proof = { path = "../../consensus/merkle_proof" }
 eth2_ssz = "0.1.2"
 eth2_hashing = "0.1.0"
 tree_hash = "0.1.1"
-tokio = { version = "1.7.1", features = ["full"] }
+tokio = { version = "1.10.0", features = ["full"] }
 parking_lot = "0.11.0"
 slog = "2.5.2"
 exit-future = "0.2.0"