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/network/Cargo.toml

@@ -31,7 +31,7 @@ eth2_ssz_types = { path =  "../../consensus/ssz_types" }
 tree_hash = "0.1.1"
 futures = "0.3.7"
 error-chain = "0.12.4"
-tokio = { version = "1.7.1", features = ["full"] }
+tokio = { version = "1.10.0", features = ["full"] }
 tokio-stream = "0.1.3"
 parking_lot = "0.11.0"
 smallvec = "1.6.1"
@@ -46,5 +46,5 @@ itertools = "0.10.0"
 num_cpus = "1.13.0"
 lru_cache = { path = "../../common/lru_cache" }
 if-addrs = "0.6.4"
-strum = { version = "0.20"}
+strum = "0.21.0"
 tokio-util = { version = "0.6.3", features = ["time"] }