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

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https://hg.mozilla.org/integration/gaia-central/rev/6b4c6dbdd5d5
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #23403 from crdlc/1053824

Bug 1053824 - Suspicious "throw" statements in fb_link.js

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https://hg.mozilla.org/integration/gaia-central/rev/f7faf7ba3b76
Author: crdlc <crdlc@tid.es>
Desc: Bug 1053824 - Suspicious "throw" statements in fb_link.js
Bumping manifests a=b2g-bump