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

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https://hg.mozilla.org/integration/gaia-central/rev/6f1233fe71d2
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #21496 from azasypkin/bug-1034633-subject-padding

Bug 1034633 - [Messages] subtle padding issues while manipulating the subject. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/34677f3afabc
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1034633 - [Messages] subtle padding issues while manipulating the subject. r=julien
Bumping manifests a=b2g-bump