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

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https://hg.mozilla.org/integration/gaia-central/rev/f6aea21f9a70
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #26576 from davehunt/bug1074117-keyboard

Bug 1074117 - Use expected conditions and optimise element lookups in keyboard app object

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https://hg.mozilla.org/integration/gaia-central/rev/37074a2f729e
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1074117 - Use expected conditions and optimise element lookups in keyboard app object. r=fstrugariu

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https://hg.mozilla.org/integration/gaia-central/rev/a9064ed8f2bb
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #26260 from tauzen/Bug1089486_nfc_toggle_disabling

Bug 1089486 - [NFC] Disable NFC toggle in settings during NFC HW change,  r=arthur.chen, r=gweng

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https://hg.mozilla.org/integration/gaia-central/rev/1ee57a93e417
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: Bug 1089486 - [NFC] Disable NFC toggle in settings during NFC HW change, r=arthur.chen, r=gweng
Bumping manifests a=b2g-bump