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

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https://hg.mozilla.org/integration/gaia-central/rev/7f029d43face
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Merge pull request #16968 from jonallengriffin/unit_timeout

Bug 967223 - Handle hangs/crashes better in gaia unit runner, r=ahal

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https://hg.mozilla.org/integration/gaia-central/rev/023ac82a2c96
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Bug 967223 - Handle hangs/crashes better in gaia unit runner, r=ahal
Bumping manifests a=b2g-bump