Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/bitcoin-abc/versions.

These checks were done:

- built on NixOS
- ran ‘/nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1/bin/bitcoind -h’ got 0 exit code
- ran ‘/nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1/bin/bitcoind --help’ got 0 exit code
- ran ‘/nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1/bin/bitcoin-cli -h’ got 0 exit code
- ran ‘/nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1/bin/bitcoin-cli --help’ got 0 exit code
- ran ‘/nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1/bin/bitcoin-tx -h’ got 0 exit code
- ran ‘/nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1/bin/bitcoin-tx --help’ got 0 exit code
- ran ‘/nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1/bin/test_bitcoin --help’ got 0 exit code
- ran ‘/nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1/bin/bitcoin-qt -h’ got 0 exit code
- ran ‘/nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1/bin/bitcoin-qt --help’ got 0 exit code
- found 0.17.1 with grep in /nix/store/ck5kx81a87c9ha625lhrfxj25s9lb31a-bitcoin-abc-0.17.1
- directory tree listing: https://gist.github.com/011ceeb08c6986692052c6b32e5f0577

altcoins.bitcoin-abc: 0.17.0 -> 0.17.1