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

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https://hg.mozilla.org/integration/gaia-central/rev/7974993733f0
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #27013 from crh0716/1103814

Bug 1103814 - Use DialogService the show the apn warnings r=eragonj

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https://hg.mozilla.org/integration/gaia-central/rev/a27f4dd09751
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1103814 - Use DialogService the show the apn warnings
Bumping manifests a=b2g-bump