editors/emacs-devel: Update to 2023-06-01 snapshot, 2d6ba3e

Building --with-cario results in an emacs binary that directly links to
freetype2 and fontconfig shared libraries, so correctly set
CAIRO_LIB_DEPENDS.

Changes: https://github.com/emacs-mirror/emacs/compare/ebf5e4c...2d6ba3e
Sponsored by: The FreeBSD Foundation