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

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https://hg.mozilla.org/integration/gaia-central/rev/d6d77c9c49c4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23973 from KevinGrandon/bug_1066299_shb_cards_view_height_landscape

Bug 1066299 - Fix task manager height in landscape with SHB

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https://hg.mozilla.org/integration/gaia-central/rev/a446410579fb
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1066299 - Fix task manager height in landscape with SHB r=eli
Bumping manifests a=b2g-bump