print/pdf-tools: Update to 0.91.63

This update pulls in a fix for a misuse of cl-ecase, which was exposed
with the latest update of editors/emacs-devel.

https://github.com/vedang/pdf-tools/commit/49078c71f1ae9e85e719029a3e5e5f5e10509017

Sponsored by: The FreeBSD Foundation