s3backer: 1.4.3 -> 1.5.0 (#41959)

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

This update was made based on information from https://repology.org/metapackage/s3backer/versions.

These checks were done:

- built on NixOS
- /nix/store/6lsma6d012qscsg8r5gcigk58f1bs93j-s3backer-1.5.0/bin/s3backer 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 1.5.0 with grep in /nix/store/6lsma6d012qscsg8r5gcigk58f1bs93j-s3backer-1.5.0
- directory tree listing: https://gist.github.com/70ca4de57ddd45b85eceae64476f7125
- du listing: https://gist.github.com/d5deb0dd7314e7a74448e9af05d695e0