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

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https://hg.mozilla.org/integration/gaia-central/rev/18d99a4d39a2
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23345 from mikehenrty/bug-1035250-fte-connectivity

Bug 1035250 fte connectivity

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https://hg.mozilla.org/integration/gaia-central/rev/3268c36b0ed9
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1035250 - Add incremental statusbar icons in FTU

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https://hg.mozilla.org/integration/gaia-central/rev/a3c9637d6729
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #23522 from DouglasSherk/1047353-temp

Bug 1047353 - Create a call information page for call log. r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/cc19bd277dd1
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 1047353 - Create a call information page for call log. r=drs
Bumping manifests a=b2g-bump