Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/276152b2cd5d
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23352 from tauzen/Bug1058088_debug_setting

Bug 1058088 - [NFC] Add a developer setting to enable NFC debug

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https://hg.mozilla.org/integration/gaia-central/rev/a51a20f67493
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: Bug 1058088 - [NFC] Add a developer setting to enable NFC debug, r=arthur.chen, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/4a73b68c2527
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23145 from tauzen/Bug_1029947_hci_demo

Bug 1029947 - [B2G][NFC] demo app to support bug 979152

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https://hg.mozilla.org/integration/gaia-central/rev/5ff91630204a
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: Bug 1029947 - [B2G][NFC] demo app to support bug 979152, r=timdream
Bumping manifests a=b2g-bump