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

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https://hg.mozilla.org/integration/gaia-central/rev/a8487645e58c
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #24162 from sv99/1069169

Bug 1069169 - [callscreen] unittest call_sccreen_test.js incorrect using assert.include for testing existing object r=Rik

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https://hg.mozilla.org/integration/gaia-central/rev/abc935a3db1c
Author: sv99 <sv99@inbox.ru>
Desc: Bug 1069169 - [callscreen] unittest call_sccreen_test.js incorrect using assert.include for testing existing object
Bumping manifests a=b2g-bump