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

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https://hg.mozilla.org/integration/gaia-central/rev/31b99c092c38
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #24513 from albertopq/107272-stk-soft-button

Bug 107272 - Truncated STK with soft-button r=frsela

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https://hg.mozilla.org/integration/gaia-central/rev/2cfd433f17fa
Author: albertopq <apastor@mozilla.com>
Desc: Bug 107272 - Truncated STK with soft-button
Bumping manifests a=b2g-bump