riemann: 0.3.0 -> 0.3.1 (#41044)

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

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

These checks were done:

- built on NixOS
- /nix/store/j7fjbp411mwd42cp5wynqvk1wr3vcxxi-riemann-0.3.1/bin/.riemann-wrapped passed the binary check.
- /nix/store/j7fjbp411mwd42cp5wynqvk1wr3vcxxi-riemann-0.3.1/bin/riemann passed the binary check.
- 2 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 0.3.1 with grep in /nix/store/j7fjbp411mwd42cp5wynqvk1wr3vcxxi-riemann-0.3.1
- directory tree listing: https://gist.github.com/ed9907cdc302813f2c87257f6a26628e
- du listing: https://gist.github.com/b50c1c815b3cd6102e0ec8d21b9f1365