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

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https://hg.mozilla.org/integration/gaia-central/rev/38fabbc650ca
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #26141 from mancas/bug1099034

Bug 1099034 - [Follow-up][settings] refactor Hotspot panel with AMD pattern r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/b6950646d743
Author: mancas <manuel.casasbarrado@telefonica.com>
Desc: Bug 1099034 - [Follow-up][settings] refactor Hotspot panel with AMD pattern
Bumping manifests a=b2g-bump