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

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https://hg.mozilla.org/integration/gaia-central/rev/148a78c85200
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17887 from askeing/991010

Bug 991010 - Fix intermittent failure of test_email_XXX.py

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https://hg.mozilla.org/integration/gaia-central/rev/6bbfc622ea46
Author: askeing <askeing@gmail.com>
Desc: Bug 991010 - Fix intermittent failure of test_email_XXX.py
Bumping manifests a=b2g-bump