Upgrade lunasvg from 2.3.5 to 2.3.8

[Lpsd]

Changes in 2.3.8
https://github.com/sammycage/lunasvg/releases/tag/v2.3.8

- Fix undefined behavior caused by a domain error on an sqrt call. by @m-carrasco in https://github.com/sammycage/lunasvg/pull/123
- CMake modernization by @seanharmer in https://github.com/sammycage/lunasvg/pull/84
- Fix for UB caused by wrong call to memcpy. by @m-carrasco in https://github.com/sammycage/lunasvg/pull/125
- Fix for UB caused by null pointer arithmetic by @m-carrasco in https://github.com/sammycage/lunasvg/pull/126
- Add missing cstdint include by @lemirep in https://github.com/sammycage/lunasvg/pull/129

Full Changelog: sammycage/lunasvg@v2.3.5...v2.3.8

[patrikjuvonen]

Sorry, I only now noticed you had made a pull request for the upgrade. Done initially at 929b3ee but merging for the effort.