[gentium] White artifacts in some characters

[Mark]

This basically is a follow-up to the message 
https://tug.org/pipermail/gentium/2023q1/000039.html :

> We have been recently contacted by a user who discovered a bug that
> actually looks like a bug in the gentium package when used with pdflatex.
> Namely, at some zoom levels and some font sizes, some characters are
> showing white artifacts.

I have seen the same issue (example attached) when ordering a print on 
demand book recently. The book was created on Fedora 39 with texlive, 
pdflatex and the gentium package with type 1 fonts. I wasn't able to 
reproduce the issue with any pdf viewer available to me nor with my own 
laser printer.

When trying to understand the issue I found the discussion thread at the 
link above. Unfortunately, I have no information about hardware/software 
used by the print on demand service, and they are not going to spend 
more effort on analyzing the problem. So the only solution for me was to 
replace gentium with a different font.

However, I found one more prominent evidence of the problem. The printed 
copy of the "LaTeX Companion, Third Edition - Part II" by Frank 
Mittelbach shows an example of the Gentium Plus font on page 45 that 
actually has the same issue (I haven't seen this on first sight, but now 
knowing about it and with a magnifier glass it is quite easy to spot).

Mark
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