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

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https://hg.mozilla.org/integration/gaia-central/rev/266f4ddfc7e2
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #24770 from lightsofapollo/bug-1077649

Bug 1077649 - Use -e correctly so we get exit codes in gaia-marionette r=mdas

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https://hg.mozilla.org/integration/gaia-central/rev/017a6d40c7ec
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 1077649 - Use -e correctly so we get exit codes in gaia-marionette
Bumping manifests a=b2g-bump