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

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https://hg.mozilla.org/integration/gaia-central/rev/4bf5b539097e
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #25470 from eeejay/bug-1088053

Bug 1088053 - Lockscreen input window state should initially have aria-h... r=snowmantw

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https://hg.mozilla.org/integration/gaia-central/rev/ed6a9182056b
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1088053 - Lockscreen input window state should initially have aria-hidden=true
Bumping manifests a=b2g-bump