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

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https://hg.mozilla.org/integration/gaia-central/rev/f939e8c12563
Author: Michał Budzyński <michal@virtualdesign.pl>
Desc: Merge pull request #18986 from michalbe/Bug1003767

Bug 1003767 - Do not share contacts photo via NFC

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https://hg.mozilla.org/integration/gaia-central/rev/c9b8c932b2d8
Author: Michal Budzynski <michal@virtualdesign.pl>
Desc: Bug 1003767 - Do not share contacts photo via NFC
Bumping manifests a=b2g-bump