make downloads resumable

[gdkrmr]

If a download gets interrupted it cannot be resumed:

$ ipget QmQhvSwnwBmwUk59r3N7KBM3S2Qksqoek7iDXVXvvxszvH
2024/11/13 10:14:40 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 7168 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes for details.
2024/11/13 10:14:40 [zeroconf] no suitable IPv6 interface: listen udp6 [ff02::]:5353: socket: address family not supported by protocol
^C
$ ipget --progress QmQhvSwnwBmwUk59r3N7KBM3S2Qksqoek7iDXVXvvxszvH
2024/11/13 10:16:54 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 7168 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes for details.
2024/11/13 10:16:54 [zeroconf] no suitable IPv6 interface: listen udp6 [ff02::]:5353: socket: address family not supported by protocol
mkdir QmQhvSwnwBmwUk59r3N7KBM3S2Qksqoek7iDXVXvvxszvH: file exists

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