Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/93729872abbe
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #23013 from eeejay/bug-1055355

Bug 1055355 - Give content editable fields ARIA textbox roles. r=steveck

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https://hg.mozilla.org/integration/gaia-central/rev/f4066c9fcd08
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1055355 - Make recipient field and suggestions screen reader friendly.

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https://hg.mozilla.org/integration/gaia-central/rev/30126aa6bbe0
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #23745 from davidflanagan/bug1055805

Bug 1055805: downsample large jpeg images before previewing as wallpaper r=pdahiya

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https://hg.mozilla.org/integration/gaia-central/rev/6bfa4ac28cb1
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1055805: downsample large jpeg images before previewing as wallpaper
Bumping manifests a=b2g-bump