Just reporting this for future reference.
Today’s graphviz update gives a warning:
[2021-05-28T10:32:22-0500] [ALPM] upgraded graphviz (2.47.1-1 -> 2.47.1-2)
[2021-05-28T10:32:22-0500] [ALPM-SCRIPTLET] Warning: Could not load "/usr/lib/graphviz/libgvplugin_gdk.so.6" - It was found, so perhaps one of its dependents was not. Try ldd.
[2021-05-28T10:32:22-0500] [ALPM-SCRIPTLET] Warning: Could not load "/usr/lib/graphviz/libgvplugin_gtk.so.6" - It was found, so perhaps one of its dependents was not. Try ldd.
[2021-05-28T10:32:22-0500] [ALPM-SCRIPTLET] Warning: Could not load "/usr/lib/graphviz/libgvplugin_gdk.so.6" - It was found, so perhaps one of its dependents was not. Try ldd.
[2021-05-28T10:32:22-0500] [ALPM-SCRIPTLET] Warning: Could not load "/usr/lib/graphviz/libgvplugin_gtk.so.6" - It was found, so perhaps one of its dependents was not. Try ldd.
It seems to be related to an optional dependency for gtk2. Apparently, this can be safely ignored.