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

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https://hg.mozilla.org/integration/gaia-central/rev/f1ccf163ecda
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #13980 from pivanov/bug-939155

Bug 939155 - [Action Icons - Cost Control] Remove shadows from action icons

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https://hg.mozilla.org/integration/gaia-central/rev/9e2b806d7553
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 939155 - [Action Icons - Cost Control] Remove shadows from action icons