*/*: Bump multimedia/openh264 consumers after dc94e01

net/freerdp{,3} have been already bumped in e447cd0, so not being bumped
again.

The following one-liner was run on the 2025Q3 branch instead of
cherry-picking 17a31bf, as cherry-picking would have resulted conficts.

$ git grep -l libopenh264 | \
    grep '^.*/.*/Makefile$'| \
    xargs -t -n1 portedit bump-revision -i

Approved by: portmgr (blanket)