Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/882a5608baa2
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #22646 from eeejay/bug-1050529

Bug 1050529 - Always toggle on a11y settings panel when screen reader is... r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/4300cef99390
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1050529 - Always toggle on a11y settings panel when screen reader is toggled.
Bumping manifests a=b2g-bump