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

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https://hg.mozilla.org/integration/gaia-central/rev/5f3e2f2ac117
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #24429 from dwi2/bug1070808

Bug 1074601 - Take SIM card 2 into consideration when checking voicemail number r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/77a20105c1b6
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1070808 - Take SIM card 2 into consideration when checking voicemail number
Bumping manifests a=b2g-bump