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 )

lighthouse/Cargo.toml

@@ -19,14 +19,14 @@ spec-minimal = []
 
 [dependencies]
 beacon_node = { "path" = "../beacon_node" }
-tokio = "1.7.1"
+tokio = "1.10.0"
 slog = { version = "2.5.2", features = ["max_level_trace"] }
 sloggers = "1.0.1"
 types = { "path" = "../consensus/types" }
 bls = { path = "../crypto/bls" }
 eth2_hashing = "0.1.0"
 clap = "2.33.3"
-env_logger = "0.8.2"
+env_logger = "0.9.0"
 logging = { path = "../common/logging" }
 slog-term = "2.6.0"
 slog-async = "2.5.0"

lighthouse/environment/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2018"
 
 [dependencies]
-tokio = { version = "1.7.1", features = ["macros", "rt", "rt-multi-thread" ] }
+tokio = { version = "1.10.0", features = ["macros", "rt", "rt-multi-thread" ] }
 slog = { version = "2.5.2", features = ["max_level_trace"] }
 sloggers = "1.0.1"
 types = { "path" = "../../consensus/types" }