flyway: 5.1.1 -> 5.1.3

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

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

These checks were done:

- built on NixOS
- /nix/store/iw4rl4pi38wjywnvw123qbr3y2nvq2b3-flyway-5.1.3/bin/flyway passed the binary check.
- 1 of 1 passed binary check by having a zero exit code.
- 0 of 1 passed binary check by having the new version present in output.
- found 5.1.3 with grep in /nix/store/iw4rl4pi38wjywnvw123qbr3y2nvq2b3-flyway-5.1.3
- directory tree listing: https://gist.github.com/106acf9a49f47aca074952bf0cc79dc7
- du listing: https://gist.github.com/51bdf3dc1d3334b3be4b67b14ea31955