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

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https://hg.mozilla.org/integration/gaia-central/rev/a9e0c273dfed
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #26066 from bebef1987/xfail_ogg

Bug 1097653 - XFail test_play_ogg_video.py on desktop MAC as it's genera...

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https://hg.mozilla.org/integration/gaia-central/rev/0066edd65427
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1097653 - XFail test_play_ogg_video.py on desktop MAC as it's generating intermittent fails
Bumping manifests a=b2g-bump