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

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https://hg.mozilla.org/integration/gaia-central/rev/536a583e498f
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #24272 from hyunacho/bug1067205

Bug 1067205 - [Camera] Not receiving 'visibilitychange' event when devic...

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https://hg.mozilla.org/integration/gaia-central/rev/afd6e528caa8
Author: hyuna.cho <hyuna.cho@lge.com>
Desc: Bug 1067205 - [Camera] Not receiving 'visibilitychange' event when device is locked
Bumping manifests a=b2g-bump