seafile-client: 6.1.0 -> 6.1.5

Semi-automatic update. These checks were performed:

- built on NixOS
- found 6.1.5 with grep in /nix/store/7y211zn1irykpjfgf8n38vbhh57xgaq2-seafile-client-6.1.5
- found 6.1.5 in filename of file in /nix/store/7y211zn1irykpjfgf8n38vbhh57xgaq2-seafile-client-6.1.5

cc "@calrama"