chore: bump dependencies

[SaveTheRbtz]

The core of the change is:

• github.com/libp2p/go-libp2p-core -> github.com/libp2p/go-libp2p/core
• github.com/libp2p/go-libp2p-netutil -> github.com/libp2p/go-libp2p-testing/netutil

Also while here fixed up TestNetworkCounters leaving existing logic. (Though test remains broken: wg.Add should be done before goroutine creation.)

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[SaveTheRbtz]

Superseded w/ #580

[Jorropo]

@SaveTheRbtz sorry I havnt seen your PR, i was doing it for kubo and just did the thing on my local fork without checkout PRs first.