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

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https://hg.mozilla.org/integration/gaia-central/rev/8da926267a7e
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #15736 from fcampo/subject-too-high-bug963050

Bug 963050 - [SMS] Subject's line-height in composer is too high
r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/f4751bd645e2
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 963050 - [SMS] Subject's line-height in composer is too high

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https://hg.mozilla.org/integration/gaia-central/rev/62c20e1815be
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #15823 from mihai/bug_952554

Bug 952554 - [SMS] Find contacts when searching with multiple terms...
r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/e87cc9bdf3f7
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 952554 - [SMS] Find contacts when searching with multiple terms which also include tel number
Bumping manifests a=b2g-bump