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

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https://hg.mozilla.org/integration/gaia-central/rev/c20b34739d57
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #12036 from etiennesegonzac/bug-913540-lazy-icc-helper

Bug 913540 - Lazy Loading the IccHelper in the dialer r=ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/eac77f8e0534
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 913540 - Lazy Loading the IccHelper in the dialer
r=ferjm