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

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https://hg.mozilla.org/integration/gaia-central/rev/fb74eec9df5a
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #23676 from tamarahills/bugfix/1061463

Bug 1061463 - Call log must not reuse the string "Missed". r=Rik

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https://hg.mozilla.org/integration/gaia-central/rev/479a29e97b8c
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1061463 -- Call log must not reuse the string Missed.
Bumping manifests a=b2g-bump