Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5686a4726b2c
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1108008 - Fix the destination path for the dialer and calendar reference workloads' databases r=jhylands

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https://hg.mozilla.org/integration/gaia-central/rev/b2ee7022edab
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1095120 - merge pull request #26209 from stasm:1095120-async-format to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/b58c524523c0
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1095120 - Add async mozL10n.format{Value,Entity} methods. r=gandalf
Bumping manifests a=b2g-bump