ci(freebsd): install bzip2 so freetype2's pkg-config resolves

The FreeBSD build broke on 'Package bzip2, required by freetype2, not found':
freetype2.pc lists bzip2 as a (private) requirement, but no bzip2.pc was
installed, so pkg-config could not generate cflags for gtkmm-3.0. Add bzip2
to the package list.

.github/workflows/freebsd.yml

@@ -29,7 +29,7 @@ jobs:
           sync_files: runner-to-vm
           run: |
             sudo pkg install -y git #  subprojects/date
-            sudo pkg install -y catch evdev-proto gtk-layer-shell gtkmm30 jsoncpp \
+            sudo pkg install -y bzip2 catch evdev-proto gtk-layer-shell gtkmm30 jsoncpp \
               libdbusmenu libevdev libfmt libmpdclient libudev-devd meson \
               pkgconf pipewire pulseaudio scdoc sndio spdlog wayland-protocols upower \
               libinotify