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

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https://hg.mozilla.org/integration/gaia-central/rev/73f60238c23e
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #22667 from mcjimenez/bug1049842_v2

Bug1049842 - Change downloadUdatesVia2GForbidden text (r = [flod, matej, alive] )

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https://hg.mozilla.org/integration/gaia-central/rev/47ff064d2118
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug1049842 - Change downloadUdatesVia2GForbidden text
Bumping manifests a=b2g-bump