Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/7545335988ef
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 1059434 - STK display text command doesn't support time duration
Bumping manifests a=b2g-bump