[LyX features/2.3.5.1] Update version.

[Richard Kimberly Heck]

The tag, 2.3.5.1, has been created.
        at  f6d14f743522dfaf70673014fca95bd7525b59d6 (commit)

- Log -----------------------------------------------------------------
commit f6d14f743522dfaf70673014fca95bd7525b59d6
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Wed Jun 3 17:12:44 2020 -0400

    Update version.
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