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

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https://hg.mozilla.org/integration/gaia-central/rev/5f064a62ce5e
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1108099 - merge pull request #26647 from stasm:1108099-format-once to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/c8f4deeaede5
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1108099 - Make formatValue wait for Context.isReady. r=gandalf
Bumping manifests a=b2g-bump