gstreamer1: bump version

Bug reports fixed in this release:

      * 724373 : Queue2 truncates its temp file when pipeline is paused
      * 725517 : docs: Fix typos and remove unknown annotations
      * 725809 : ghostpad: rare crash because of missing reference count on its target pad
      * 727253 : parse: Bison generated file included in the release tarballs causes compile errors
      * 727883 : baseparse: Memory leak of queue frames

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>