Log Message:
graphics/ruby-RMagick: update to 4.0.0

Update ruby-RMagick to 4.0.0.

## RMagick 4.0.0

This release removes a *lot* of deprecated functionality, so first upgrade to
3.2 and handle any deprecation warnings you see there before upgrading to 4.0.
There are a handful of removals that we could not, or forgot to deprecate, so
pay special attention to those below. This clears the road for ImageMagick 7
support in the very near future.

Breaking Changes:

- Removed deprecated Image#matte and Image#matte= (#731)
- Removed deprecated Draw#matte. (#736)
- Removed deprecated ImageList#fx. (#732)
- Removed deprecated Info#group and Info#group=. (#733)
- Removed deprecated KernelInfo#show. (#734)
- Removed deprecated Pixel#opacity and Pixel#opacity=. (#735)
- Removed deprecated KernelInfo#zero_nans. (#741)
- Removed deprecated ImageList#map (#740)
- Removed deprecated Pixel#from_HSL. (#742)
- Removed deprecated Image#alpha=. (#739)
- Removed deprecated Pixel#to_HSL. (#745)
- Removed deprecated Image#blur and Image#blur=. (#746)
- Removed deprecated Image#sync_profiles. (#754)
- Removed deprecated Image#opacity=. (#753)
- Removed deprecated Image#combine. (#752)
- Removed deprecated Image#map. (#751)
- Removed deprecated Image#mask=. (#750)
- Removed deprecated opacity arguments. (#757)
- Removed deprecated `OpaqueOpacity` and `TransparentOpacity`. (#765)
- Removed obsolete enumerations. (#766)

The following changes *did not have deprecation warnings* in 3.2, so you'll
want to double check that you update your code if you were relying on the
existing behavior:

- Changed Color#to_s to return an string that contains alpha instead of opacity. \ 
(#760)
- Changed Pixel#to_s to return a string that contains alpha instead of opacity. \ 
(#762)
- Changed Pixel#hash to use alpha instead of opacity. (#763)
- Changed Pixel#<=> to use alpha instead of opacity. (#764)
- Removed `BicubicInterpolatePixel` (use `CatromInterpolatePixel` instead) (#768)
- Removed `FilterInterpolatePixel` (no replacement) (#768)
- Renamed `NearestNeighborInterpolatePixel` to `NearestInterpolatePixel` (#768)

Enhancements:

- Add SetQuantumOperator (#755)

Bug Fixes:

- Fix SEGV in Image#each_profile (#737)