Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8fed0f3eae7c
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #21909 from crh0716/1038496

Bug 1038496 - Re-enable radio when rild crashes r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/5c51ff82eba9
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1038496 - Re-enable radio when rild crashes

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https://hg.mozilla.org/integration/gaia-central/rev/8729acd2284d
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #23083 from azasypkin/bug-1056044-mock-ready-state

Bug 1056044 - Make MockL10n.readyState as "complete" by default. r=gandalf

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https://hg.mozilla.org/integration/gaia-central/rev/87b077736b03
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1056044 - Make MockL10n.readyState as "complete" by default. r=gandalf
Bumping manifests a=b2g-bump