Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a48dd132b730
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22751 from mikehenrty/bug-1041910-music-theme

Bug 1041910 - Add theme color for music app

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https://hg.mozilla.org/integration/gaia-central/rev/8586aa6e92a4
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1041910 - Add theme color for music app

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https://hg.mozilla.org/integration/gaia-central/rev/1d7bbaa91534
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23166 from mikehenrty/bug-1041902-cost-control-theme-revisit

Bug 1041902 - Add theme color for cost control

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https://hg.mozilla.org/integration/gaia-central/rev/6960f7dd95b3
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1041902 - Add theme color for cost control

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https://hg.mozilla.org/integration/gaia-central/rev/effe34be7de1
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23168 from mikehenrty/bug-1041904-email-theme-revisted

Bug 1041904 - Update email theme color

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https://hg.mozilla.org/integration/gaia-central/rev/5550feb78a70
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1041904 - Update email theme color
Bumping manifests a=b2g-bump