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

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https://hg.mozilla.org/integration/gaia-central/rev/176563644b91
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #24644 from DouglasSherk/1060451-dialer-telephony-helper2

Bug 1060451 - Refactor TelephonyHelper code to be shared with dialer and emergency-call. r=Rik, r=francisco

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https://hg.mozilla.org/integration/gaia-central/rev/e4af1f0fa17e
Author: Doug Sherk <github@sherk.me>
Desc: Bug 1060451 - Refactor TelephonyHelper code to be shared with dialer and emergency-call. r=Rik, r=francisco

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https://hg.mozilla.org/integration/gaia-central/rev/6bd3e694a3ef
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #24688 from crdlc/bug-download-picker

Bug 848400 - [E-Mail] Support attaching any file available on the SD car...

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https://hg.mozilla.org/integration/gaia-central/rev/b1cdab6d8b34
Author: crdlc <crdlc@tid.es>
Desc: Bug 848400 - [E-Mail] Support attaching any file available on the SD card(s)
Bumping manifests a=b2g-bump