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

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https://hg.mozilla.org/integration/gaia-2_1/rev/7678afaf886e
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #25061 from shamenchens/Bug1081658-L10nRemoveLocale

Bug 1081658 - Fix l10n remove locale regex, r=RickyChien

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https://hg.mozilla.org/integration/gaia-2_1/rev/6ee59337f01d
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1081658 - Fix l10n remove locale regex
Bumping manifests a=b2g-bump