pkg-config is now provided by pkgconf

There no pkg-config source package in Bookworm, thanks to our own
@andrewsh who managed the transition to pkgconf.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

apertis.platform/blacklist

@@ -20,8 +20,6 @@
 # dependency on gstreamer-libav in aperits is dropped because it pulls ffmpeg
 # https://gitlab.apertis.org/pkg/tracker-miners/-/commit/15175fd4dd37fc9a675d573ae42d84593dd4bace
  * !%gst-libav1.0
-# Can use pkg-config
- * !%pkgconf
 # libreoffice, evolution not required
  * !%libreoffice
  * !%evolution