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

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https://hg.mozilla.org/integration/gaia-central/rev/a3d92c257058
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #22877 from frsela/STK/Bug1027396

Bug 1027396 - Stk Timer Expiration Envelope Command requires timer value, r=ehung

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https://hg.mozilla.org/integration/gaia-central/rev/4a271b418ad5
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 1027396 - Stk Timer Expiration Envelope Command requires timer value
Bumping manifests a=b2g-bump