Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/ff2462b5cbd4
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #10606 from samjoch/bug-829027-SettingsCheckNowButton

Bug 829027 - [Settings] "Check Now" button in Device Information, Softwa... r=:etienne

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https://hg.mozilla.org/integration/gaia-central/rev/a39cf15c3f07
Author: Sam Joch <samuel@guiora.com>
Desc: Bug 829027 - [Settings] "Check Now" button in Device Information, Software Updates should be disabled when there are no connections available