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

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https://hg.mozilla.org/integration/gaia-central/rev/1f5a152e806a
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #23871 from DouglasSherk/1060725-dialer-ice-audit

Bug 1060725 - Add missing tests to ICEContacts. r=Rik

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https://hg.mozilla.org/integration/gaia-central/rev/e5fbb94e4763
Author: Doug Sherk <github@sherk.me>
Desc: Bug 1060725 - Add missing tests to ICEContacts. r=Rik

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https://hg.mozilla.org/integration/gaia-central/rev/75c648ee3457
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23875 from KevinGrandon/bug_1065179_app_auth_dialog

Bug 1065179 - [System] Update app authentication dialog to use gaia-header r=wilsonpage

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https://hg.mozilla.org/integration/gaia-central/rev/8af051283687
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1065179 - [System] Update app authentication dialog to use gaia-header
Bumping manifests a=b2g-bump