imagemagick7: 7.0.7-35 -> 7.0.8-2

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

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

These checks were done:

- built on NixOS
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/animate passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/compare passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/composite passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/conjure passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/convert passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/display passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/identify passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/import passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/magick-script passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/mogrify passed the binary check.
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/montage passed the binary check.
- Warning: no invocation of /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/stream had a zero exit code or showed the expected version
- /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2/bin/magick passed the binary check.
- 12 of 13 passed binary check by having a zero exit code.
- 0 of 13 passed binary check by having the new version present in output.
- found 7.0.8-2 with grep in /nix/store/x4mcjcryj5q7mm7bcmr1shyx1rvazpw1-imagemagick-7.0.8-2
- directory tree listing: https://gist.github.com/de6e213f2639e6aea0a5c353ee83f68b
- du listing: https://gist.github.com/936da3ad90cfeb17b4597d3a305dbffb