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

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https://hg.mozilla.org/integration/gaia-central/rev/d857856338aa
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #24262 from EragonJ/bug-1068978

Bug 1068978 - [CBS] Migrate all ril.cellbroadcast.disabled setting to mu...

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https://hg.mozilla.org/integration/gaia-central/rev/64952df81e88
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1068978 - [CBS] Migrate all ril.cellbroadcast.disabled setting to multi client format
Bumping manifests a=b2g-bump