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

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https://hg.mozilla.org/integration/gaia-central/rev/88628e86b7b1
Author: Michał Budzyński <michal@virtualdesign.pl>
Desc: Merge pull request #16326 from michalbe/nfc-contacts

Bug 903245 - NFC support in contacts

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https://hg.mozilla.org/integration/gaia-central/rev/d3dbcc917d45
Author: Michal Budzynski <michal@virtualdesign.pl>
Desc: Bug 903245 - NFC support in contacts
Bumping manifests a=b2g-bump