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

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https://hg.mozilla.org/integration/gaia-central/rev/b2473551a617
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #25354 from rnowm/1085310

Bug 1085310 - [BB] Update activity progress indicators to latest VD r=pivanov

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https://hg.mozilla.org/integration/gaia-central/rev/f1ec851e180d
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1085310 - [BB] Update activity progress indicators to latest VD
Bumping manifests a=b2g-bump