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

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https://hg.mozilla.org/integration/gaia-central/rev/5ac5df7f279b
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #22382 from crh0716/1046068

Bug 1046068 - Add the default value for mms delivery report

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https://hg.mozilla.org/integration/gaia-central/rev/12f299ead266
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1046068 - Add the default value for mms delivery report
Bumping manifests a=b2g-bump