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

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https://hg.mozilla.org/integration/gaia-central/rev/6d3e3526041d
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #18824 from crdlc/bug-996866

Bug 996866 - [B2G][Facebook][Contacts] Update Imported Friends button do...

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https://hg.mozilla.org/integration/gaia-central/rev/9af2f622deb7
Author: crdlc <crdlc@tid.es>
Desc: Bug 996866 - [B2G][Facebook][Contacts] Update Imported Friends button does not sync profile photo
Bumping manifests a=b2g-bump