springLobby: 0.255 -> 0.264 (#41508)

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

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

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/i6g7iand22k99ry0hjda1gs71amk9q11-springlobby-0.264/bin/springlobby had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/i6g7iand22k99ry0hjda1gs71amk9q11-springlobby-0.264/bin/.springlobby-wrapped had a zero exit code or showed the expected version
- 0 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 0.264 with grep in /nix/store/i6g7iand22k99ry0hjda1gs71amk9q11-springlobby-0.264
- directory tree listing: https://gist.github.com/4d077ab682c9643337f22bf2bd75f51c
- du listing: https://gist.github.com/f215b8788c2ea5ebb286f3dddc34fdf9