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

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https://hg.mozilla.org/integration/gaia-central/rev/d785455ac94f
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #14023 from jugglinmike/907177-add-integration-tests-4

Bug 907177 - [Clock] Add integration tests

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https://hg.mozilla.org/integration/gaia-central/rev/e557f51eadae
Author: Mike Pennisi <mike@mikepennisi.com>
Desc: Bug 907177 - [Clock] Add integration tests

r=lightsofapollo