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

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https://hg.mozilla.org/integration/gaia-central/rev/997af0291743
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #23459 from viorelaioia/bug_1060236

Bug 1060236 - Fix failure in test_cards_view_with_two_apps.py

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https://hg.mozilla.org/integration/gaia-central/rev/ccb85438faae
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1060236 - Fix failure in test_cards_view_with_two_apps.py
Bumping manifests a=b2g-bump