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

========

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)
Bug 881636 - Don't try to update accessibles without their own content in DocAccessible::UpdateTree(). r=surkov, a=akeybl
Bug 918864. r=bz, a=abillings
Bug 807282 - Update marionette command/response to match that of the WebDriver spec; r=mdas, a=test-only
Back out ce79da6bb7ca (bug 807282) for permaorange b2g mochitest-7, a=broken-test-only