aws-sdk-cpp: 1.4.33 -> 1.4.40

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

This update was made based on information from https://repology.org/metapackage/aws-sdk-cpp/versions.

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 1.4.40 with grep in /nix/store/gd2sihwpr8xipj6k5ych7gzj6024kc54-aws-sdk-cpp-1.4.40
- directory tree listing: https://gist.github.com/559971e38c15ec82c70c6d9f6f785465