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

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https://hg.mozilla.org/integration/gaia-central/rev/8dfbf27b53f0
Author: Salvador de la Puente <salva@unoyunodiez.com>
Desc: We prefer to provide a more error-proof regex.

Revert "Merge pull request #16136 from gitmai/bug-970320-CC-add-movistar-uruguay"

This reverts commit a5099dd1cc3e6761022b979bb58d2d29744a61d8, reversing
changes made to bf1b832d29f0caf5bb4478f681fbc145b4968c7b.
Bumping manifests a=b2g-bump