Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/201c6107cbed
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #16866 from lightsofapollo/fix-bad-things

download firefox from s3

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https://hg.mozilla.org/integration/gaia-central/rev/d4d47da75491
Author: James Lal <james@lightsofapollo.com>
Desc: hardcode b2g to s3

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https://hg.mozilla.org/integration/gaia-central/rev/28edf87c411c
Author: James Lal <james@lightsofapollo.com>
Desc: download firefox from s3
Bumping manifests a=b2g-bump