bump svg2ttf to >= 5.2

Bump `svg2ttf` to v5.2 (to check if possible v6) fix vulnerability [GHSA-h6q6-9hqw-rwfv](https://github.com/advisories/GHSA-h6q6-9hqw-rwfv)

This library has bumped deps in v5.2 to fix such vulnerability. See:

https://github.com/fontello/svg2ttf/blob/d8a426247c6f61b00e4cdd5bd36ec0c57b404444/package.json#L33

Inspect the repository's dependency declaration for `svg2ttf`, then compare the v5.2 dependency changes linked in the issue and assess whether v6 is compatible. Run the project's existing tests or build checks after the update; done means the vulnerability is addressed without regressions.

Written by the indexing model from the issue text.