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

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https://hg.mozilla.org/integration/gaia-central/rev/7a07d1c668d5
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15598 from etiennesegonzac/bug-959914-dsds-emergency-call

Bug 959914 - Always dialEmergency from the first service when there are no sim cards.
r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/da390273bd9d
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 959914 - Always dialEmergency from the first service when there are no sim cards.
r=rik
Bumping manifests a=b2g-bump