Bumping gaia.json for 1 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/f10000307fd4
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
(cherry picked from commit f400efc804366c7b7cf5476d1d5d325e6651ee71)