Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/34d40ad8d3dc
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #20791 from mnjul/bug_1027536_lockscreen_clock_stall"

This reverts commit fcc1d87b8529a8eec109b2aa5cf57129c46904fd.
Bumping manifests a=b2g-bump