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

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https://hg.mozilla.org/integration/gaia-central/rev/139421932b17
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #18323 from rnowm/996207

Bug 996207 - Create progress step widged to be used in FTE, in progress [BB] r=pivanov

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https://hg.mozilla.org/integration/gaia-central/rev/13818fd91208
Author: Arnau <arnau@arnaumarch.com>
Desc: Bug 996207 - Create progress step widged to be used in FTE, in progress [BB]
Bumping manifests a=b2g-bump