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

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https://hg.mozilla.org/integration/gaia-central/rev/5ed37bef1db4
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14085 from pivanov/bug-943321

Bug 943321 - [Shared] Followup: remove drop shadows from action icons

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https://hg.mozilla.org/integration/gaia-central/rev/607d6cadff06
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 943321 - [Shared] Followup: remove drop shadows from action icons