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

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https://hg.mozilla.org/integration/gaia-central/rev/20c044e8082d
Author: autolander <kgrandon@mozilla.com>
Desc: Bug 1102118 - merge pull request #26319 from KevinGrandon:bug_1102118_collection_l10n_strings to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/67fea0ccf95e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1102118 - [Collection] Remove html strings from view page r=kgrandon
Bumping manifests a=b2g-bump