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

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https://hg.mozilla.org/integration/gaia-1_4/rev/25a91870690d
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #19989 from comoyo/bug-1020109

Bug 1020109 - Cell broadcast search list is not set correctly. r=arthurcc
Bumping manifests a=b2g-bump