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

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https://hg.mozilla.org/integration/gaia-central/rev/2b892da04c05
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #24080 from RudyLu/keyboard/Bug1053672-symbol_refinement

Bug 1053672 - Refine the symbol panel.
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/e7c610903070
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1053672 - Refine the symbol panel.
Bumping manifests a=b2g-bump