Update libp2p to 0.34.0

[mpapierski]

This fixes security advisory on libp2p-deflate. See libp2p/rust-libp2p#1932. Quite a lot of changes

WIP clippy issues

warning: large size difference between variants
   --> node/src/reactor/joiner.rs:133:5
    |
133 |     BlockValidator(#[serde(skip_serializing)] block_validator::Event<BlockHeader, NodeId>),
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this variant is 600 bytes
    |
    = note: `#[warn(clippy::large_enum_variant)]` on by default
note: and the second-largest variant is 336 bytes:
   --> node/src/reactor/joiner.rs:85:5
    |
85  |     SmallNetwork(small_network::Event<Message>),
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#large_enum_variant
help: consider boxing the large fields to reduce the total size of the enum
    |
133 |     BlockValidator(#[serde(skip_serializing)] Box<block_validator::Event<BlockHeader, NodeId>>),
    |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

^C  Building [=======================> ] 883/891: casper-node, casper-node

[Fraser999]

Closed in favour of #820 which builds upon this.