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

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https://hg.mozilla.org/integration/gaia-central/rev/34b65164160e
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #18678 from crdlc/bug-996569

Bug 996569 - Importing FB contacts is soooooooooooooooooooo slow

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https://hg.mozilla.org/integration/gaia-central/rev/bb694fbc2ee6
Author: crdlc <crdlc@tid.es>
Desc: Bug 996569 - Improve performance of FB and other services contacts importation
Bumping manifests a=b2g-bump