chore: update boxo, go-libp2p, and internalize mplex (#10095)

config/bootstrap_peers.go

config/init.go

core/core_test.go

core/corehttp/metrics_test.go

core/node/builder.go

core/node/libp2p/internal/mplex/conn.go

core/node/libp2p/internal/mplex/stream.go

core/node/libp2p/internal/mplex/transport.go

core/node/libp2p/internal/mplex/transport_test.go

core/node/libp2p/routingopt_test.go

core/node/libp2p/smux.go

docs/config.md

docs/examples/kubo-as-a-library/go.mod

docs/examples/kubo-as-a-library/go.sum

docs/file-transfer.md

go.mod

go.sum

test/dependencies/go.mod

test/dependencies/go.sum

test/sharness/t0120-bootstrap.sh