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

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https://hg.mozilla.org/integration/gaia-central/rev/6369b3b6c2a6
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #26689 from shamenchens/Bug1105124-USSDResponseText-master

Bug 1105124 - Clear response text when MMI response form is closed, r=gsvelto

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https://hg.mozilla.org/integration/gaia-central/rev/ad57d4b45a1d
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1105124 - Clear response text when MMI response form is closed
Bumping manifests a=b2g-bump