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

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https://hg.mozilla.org/integration/gaia-central/rev/c52608adbc36
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #25958 from eeejay/bug-1095619

Bug 1095619 - Remove misuse of styled aria-hidden. r=mai r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/66a11421bfa2
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1095619 - Remove misuse of styled aria-hidden
Bumping manifests a=b2g-bump