dbus: bump version

Fixes security issues:
- CVE-2012-3524: Don't access environment variables (fd.o #52202)
  Thanks to work and input from Colin Walters, Simon McVittie,
  Geoffrey Thomas, and others.

- Be more careful about monotonic time vs. real time, fixing
  DBUS_COOKIE_SHA1 spec-compliance (fd.o #48580, David Zeuthen)

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>