Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/40544d9ef5ea
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #12856 from Neeraj-Seth/bug-890207_cursor_hide_issue

Bug 890207 - [B2G][Gaia][Keyboard][Auto-correction] If a wording include...(cherry picked from commit 37032f754c7186a9e7e1bf4e848db94ca2584a4c)