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

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https://hg.mozilla.org/integration/gaia-central/rev/76375434f4d1
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #19193 from luke-chang/1009379_stingray_change_appentrypoint_naming

Bug 1009379 - [Stingray] The naming of "AppEntryPoint" object in applications.js is inconsistent, r=gchen, r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/13d88553131f
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 1009379 - [Stingray] The naming of "AppEntryPoint" object in applications.js is inconsistent
Bumping manifests a=b2g-bump