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

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https://hg.mozilla.org/integration/gaia-central/rev/379c5a8dd25e
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25337 from tauzen/Bug1084160_ndef_formatable_removal

Bug 1084160 - [NFC] NDEF_FORMATABLE, NDEF_WRITABLE removal from NfcManager, r=gweng

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https://hg.mozilla.org/integration/gaia-central/rev/976be8377da7
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: Bug 1084160 - [NFC] NDEF_FORMATABLE, NDEF_WRITABLE removal from NfcManager, r=gweng
Bumping manifests a=b2g-bump