eth: drop eth/65, the last non-reqid protocol version

cmd/devp2p/internal/ethtest/suite_test.go

eth/downloader/downloader.go

eth/downloader/downloader_test.go

eth/downloader/peer.go

eth/handler.go

eth/handler_eth_test.go

eth/protocols/eth/handler.go

eth/protocols/eth/handler_test.go

eth/protocols/eth/handlers.go

eth/protocols/eth/handshake_test.go

eth/protocols/eth/peer.go

eth/protocols/eth/protocol.go

eth/sync.go

eth/sync_test.go

les/client_handler.go