herbstluftwm: update to 0.9.3

[xaverh]

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

The new dependency to libXrender-devel is mentioned in upstream's changelog.

[paper42]

Hi, could you remove the "Merge branch" commit from this PR? The command to rebase on top of void's master (which should remove the merge commit) is git pull --rebase upstream master

[xaverh]

Thank you for your help. I hope, everything is in the right format now.

[paper42]

your PR is great now, but when we are here, let's fix some more small cosmetic issues

[paper42]

Now it's perfect, thanks for contributing!