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

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https://hg.mozilla.org/integration/gaia-central/rev/a64e848f8978
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #25236 from justindarc/bug1064600

Bug 1064600 - [Gallery] preliminary modularization before full gallery refresh

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https://hg.mozilla.org/integration/gaia-central/rev/c1b100f7d3a0
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1064600 - [Gallery] preliminary modularization before full gallery refresh

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https://hg.mozilla.org/integration/gaia-central/rev/f3fab78d57d8
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #25591 from zbraniecki/1088271-give-customdialog-text-a-span

Bug 1088271 - Give CustomDialog text it's own span. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/d24c2df68f84
Author: Zibi Braniecki <gandalf@mozilla.com>
Desc: Bug 1088271 - Give CustomDialog text it's own span
Bumping manifests a=b2g-bump