altcoins.litecoin: 0.15.1 -> 0.16.0 (#41545)

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

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

These checks were done:

- built on NixOS
- /nix/store/27nwgb0f89hmkhfd4rs7lp78dhdnmkd3-litecoin-0.16.0/bin/litecoind passed the binary check.
- /nix/store/27nwgb0f89hmkhfd4rs7lp78dhdnmkd3-litecoin-0.16.0/bin/litecoin-cli passed the binary check.
- /nix/store/27nwgb0f89hmkhfd4rs7lp78dhdnmkd3-litecoin-0.16.0/bin/litecoin-tx passed the binary check.
- /nix/store/27nwgb0f89hmkhfd4rs7lp78dhdnmkd3-litecoin-0.16.0/bin/test_litecoin passed the binary check.
- /nix/store/27nwgb0f89hmkhfd4rs7lp78dhdnmkd3-litecoin-0.16.0/bin/bench_litecoin passed the binary check.
- Warning: no invocation of /nix/store/27nwgb0f89hmkhfd4rs7lp78dhdnmkd3-litecoin-0.16.0/bin/litecoin-qt had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/27nwgb0f89hmkhfd4rs7lp78dhdnmkd3-litecoin-0.16.0/bin/test_litecoin-qt had a zero exit code or showed the expected version
- 5 of 7 passed binary check by having a zero exit code.
- 0 of 7 passed binary check by having the new version present in output.
- found 0.16.0 with grep in /nix/store/27nwgb0f89hmkhfd4rs7lp78dhdnmkd3-litecoin-0.16.0
- directory tree listing: https://gist.github.com/c4a75d440e40edc63d7f86819e60beda
- du listing: https://gist.github.com/72a199fee6e78c7261e85fc15fa3c1d6