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

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https://hg.mozilla.org/integration/gaia-central/rev/fa26af9d541d
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #16659 from jmcanterafonseca/birthday_take2

Bug 935045 - Allow the user to enter birth date in contact add and conta...

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https://hg.mozilla.org/integration/gaia-central/rev/4df728102db6
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 935045 - Allow the user to enter birth date in contact add and contact edit
Bumping manifests a=b2g-bump