Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6cc1aa08e6dd
Author: dwi2 <dwi2@dwi2.com>
Desc: Merge pull request #22653 from dwi2/bug1047998

Bug 1047998 - [dialer] Long number is not showed properly

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https://hg.mozilla.org/integration/gaia-central/rev/7840c1b96203
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1047998 - [dialer] Long number is not showed properly
Bumping manifests a=b2g-bump