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

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https://hg.mozilla.org/integration/gaia-central/rev/50463c0a9acc
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #18327 from frsela/STK/Bug978434

Bug 978434 - STK Select timeout is not set correctly from test app and takes 14-25 secs to return the Terminal Response (v1.3), r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/b34a8a1db3bb
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 978434 - STK Select timeout is not set correctly from test app and takes 14-25 secs to return the Terminal Response (v1.3)
Bumping manifests a=b2g-bump