chore: switch dep from libfreetype6 to libfreetype

Log:

Author: Decodetalkers

debian/control

@@ -27,7 +27,7 @@ Build-Depends:
  golang-gopkg-check.v1-dev,
  libcairo2-dev,
  libcanberra-dev,
- libfreetype6-dev,
+ libfreetype-dev,
  libgdk-pixbuf2.0-dev,
  libgtk-3-dev,
  libpoppler-glib-dev,