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

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https://hg.mozilla.org/integration/gaia-central/rev/d6830e998871
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #26231 from steveck-chung/message-RTL

Bug 1053709 - Make SMS messages content UI RTL-friendly, r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/04ef6d39b8d3
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 1053709 - Make SMS messages content UI RTL-friendly, r=julienw
Bumping manifests a=b2g-bump