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

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https://hg.mozilla.org/integration/gaia-central/rev/487b23711584
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26179 from huchengtw-moz/bug-1038073-ui-test-v2

Bug 1038073 - Extend UITest app to be able to do hardware buttons testin...r=altsai

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https://hg.mozilla.org/integration/gaia-central/rev/bd8c0243ee76
Author: John Hu <johu@mozilla.com>
Desc: Bug 1038073 - Extend UITest app to be able to do hardware buttons testing
Bumping manifests a=b2g-bump