*: Fix newly raised clippy warnings (backport #3106)

[mergify]

This is an automatic backport of pull request #3106 done by Mergify.
Cherry-pick of c32f03c has failed:

On branch mergify/bp/rust-v0480-testplan/pr-3106
Your branch is up to date with 'origin/rust-v0480-testplan'.

You are currently cherry-picking commit c32f03c3.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   core/src/identity/ecdsa.rs
	modified:   examples/chat-tokio.rs
	modified:   examples/chat.rs
	modified:   examples/distributed-key-value-store.rs
	modified:   examples/file-sharing.rs
	modified:   examples/ipfs-kad.rs
	modified:   examples/ipfs-private.rs
	modified:   examples/mdns-passive-discovery.rs
	modified:   examples/ping.rs
	modified:   muxers/mplex/src/codec.rs
	modified:   protocols/gossipsub/src/behaviour.rs
	modified:   protocols/gossipsub/src/peer_score.rs
	modified:   protocols/gossipsub/src/peer_score/tests.rs
	modified:   protocols/gossipsub/src/subscription_filter.rs
	modified:   protocols/kad/src/kbucket/key.rs
	modified:   protocols/relay/src/v2/relay.rs
	modified:   protocols/rendezvous/src/client.rs
	modified:   protocols/rendezvous/src/server.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   examples/gossipsub-chat.rs
	both modified:   protocols/kad/src/query/peers/closest/disjoint.rs

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[thomaseizinger]

Not worth it.