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

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https://hg.mozilla.org/integration/gaia-central/rev/6338650b81e5
Author: Albert <acperez@tid.es>
Desc: Merge pull request #15652 from acperez/bug-963061

Bug 963061 - Clear single variant applications stored in persist partition when flashing gaia

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https://hg.mozilla.org/integration/gaia-central/rev/fee8e7774972
Author: Albert <acperez@tid.es>
Desc: Bug 963061 - Clear single variant applications stored in persist partition when flashing gaia

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https://hg.mozilla.org/integration/gaia-central/rev/62e7ecdd9852
Author: gitmai <mri@tid.es>
Desc: Merge pull request #15411 from gitmai/bug-928620-CC-set-reset-report-works-abnormal

Bug 928620 - [Buri][Data usage]Set the phone and internet data report is...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/bb9aba43476e
Author: mai <mri@tid.es>
Desc: Bug 928620 - [Buri][Data usage]Set the phone and internet data report is abnormal
Bumping manifests a=b2g-bump