libraw: 0.18.11 -> 0.18.12 (#42000)

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

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

These checks were done:

- built on NixOS
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/raw-identify passed the binary check.
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/unprocessed_raw passed the binary check.
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/4channels passed the binary check.
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/simple_dcraw passed the binary check.
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/mem_image passed the binary check.
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/dcraw_half passed the binary check.
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/half_mt passed the binary check.
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/multirender_test passed the binary check.
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/postprocessing_benchmark passed the binary check.
- /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12/bin/dcraw_emu passed the binary check.
- 10 of 10 passed binary check by having a zero exit code.
- 0 of 10 passed binary check by having the new version present in output.
- found 0.18.12 with grep in /nix/store/a93d1dzw2ngcysj5sb3pj5ih6dcm8a1m-libraw-0.18.12
- directory tree listing: https://gist.github.com/20e1b0e52e1c94011da90df577fa84e2
- du listing: https://gist.github.com/adb7f31a821d3bd4157e8003f58d47ce