Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8bd8ec59122b
Author: DouglasSherk <github@sherk.me>
Desc: Revert "Bug 911055 - [zffos1.1][P3][Dailer]DuT doesn allow to dial a <<pause>>"

This reverts commit a02772c128ae7e86d3563acc8700a65819debb34.
Bumping manifests a=b2g-bump