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

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https://hg.mozilla.org/integration/gaia-central/rev/d04c5d6ed8a7
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #14901 from etiennesegonzac/bug-952099-better-hang-up-hit-target

Bug 952099 - Better hit target for the call screen hang up / pick up buttons. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/61399480a8ec
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 952099 - Better hit target for the call screen hang up / pick up
button.