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

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https://hg.mozilla.org/integration/gaia-central/rev/5fed274e799a
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #15301 from vingtetun/bug951375

Bug 951375 - [FTE] Cannot pan the First time Experience page. r=borja

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https://hg.mozilla.org/integration/gaia-central/rev/8f9e4ce41d86
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 951375 - [FTE] Cannot pan the First time Experience page. r=borja

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https://hg.mozilla.org/integration/gaia-central/rev/7547bd2eaf65
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #15302 from vingtetun/bug959144

Bug 959144 - Can not scroll calendar app after looking at an event. r=kg...

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https://hg.mozilla.org/integration/gaia-central/rev/6537cab66ee7
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 959144 - Can not scroll calendar app after looking at an event. r=kgrandon