Update tokio requirement from 0.1.11 to 1.36.0 #2530

Job	Run time
cargo +1.56 build	1m 32s
cargo minimal-versions build	28s
cargo test (ubuntu-latest)	23s
cargo +1.36 build (futures-{core, io, sink})	59s
cargo test (macos-latest)	1m 4s
cargo +stable build	25s
cargo test (windows-latest)	59s
cargo +beta build	39s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	46s
cargo +nightly build	39s
cargo bench	47s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	59s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	41s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	45s
cargo clippy	21s
cargo hack check --feature-powerset	2m 31s
cargo miri test	8m 34s
cargo build --target thumbv7m-none-eabi	49s
cargo build --target thumbv6m-none-eabi	30s
cargo test -Z sanitizer=address	1m 10s
cargo doc	20s
cargo test -Z sanitizer=memory	1m 8s
cargo fmt	4s
cargo test -Z sanitizer=thread	47s
	27m 20s

Provide feedback