[SECURITY] Fedora 34 Update: djvulibre-3.5.27-28.fc34

DjVu is a web-centric format and software platform for distributing documen ts and images. DjVu can advantageously replace PDF, PS, TIFF, JPEG, and GIF for distributing scanned documents, digital documents, or high-resolution pictu res. DjVu content downloads faster, displays and renders faster, looks nicer on a screen, and consume less client resources than competing formats. DjVu imag es display instantly and can be smoothly zoomed and panned with no lengthy re-rendering. DjVuLibre is a free (GPL’ed) implementation of DjVu, including viewers, decoders, simple encoders, and utilities. The browser plugin is in its own separate sub-package.