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

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https://hg.mozilla.org/integration/gaia-central/rev/2bf6819ac166
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #22380 from zacc/bug_1033975

Bug 1033975 - Resolve Python suite crash handling

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https://hg.mozilla.org/integration/gaia-central/rev/81cc6b9c3558
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1033975 - Resolve Python suite crash handling
Bumping manifests a=b2g-bump