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

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https://hg.mozilla.org/integration/gaia-central/rev/864cabbeed24
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26929 from huchengtw-moz/bug-1114399-button-group-is-still-opened

Bug 1114399 - [Stingray][Home] check if the opening/closing is changed w..., r=dwi2

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https://hg.mozilla.org/integration/gaia-central/rev/24f81f71aa6b
Author: John Hu <johu@mozilla.com>
Desc: Bug 1114399 - [Stingray][Home] check if the opening/closing is changed while moving to next state
Bumping manifests a=b2g-bump