libsixel: update to 1.10.3, switch upstream

[cinerea0]

General

• This is a new package and it conforms to the quality requirements

Have the results of the proposed changes been tested?

• I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
• I generally don't use the affected packages but briefly tested this PR

[cinerea0]

This won't build properly until the new upstream adds SONAME versioning; waiting on this issue to be resolved: libsixel/libsixel#37.

[dankamongmen]

This won't build properly until the new upstream adds SONAME versioning; waiting on this issue to be resolved: libsixel/libsixel#37.

i've got your corner; done

[cinerea0]

@dankamongmen Thank you! I'll watch the libsixel repo for releases so I can update this when the next release comes out.

[dankamongmen]

@dankamongmen Thank you! I'll watch the libsixel repo for releases so I can update this when the next release comes out.

you can just ask =] i'll put one out for you now.

[dankamongmen]

@dankamongmen Thank you! I'll watch the libsixel repo for releases so I can update this when the next release comes out.

you can just ask =] i'll put one out for you now.

1.10.3 hot off the presses for my good friends in void linux

[cinerea0]

@dankamongmen Thanks again! I've switched to the new release for this PR. @abenson, I'm pinging you here because this is your package.