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

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https://hg.mozilla.org/integration/gaia-central/rev/34d0fa6b3f36
Author: KWierso <kwierso@gmail.com>
Desc: Revert "Merge pull request #16656 from Rik/telephony-promise-969280" for breaking gaia-unit test

This reverts commit 52ad4108920c48d68565992a31fc3901ab5168c3, reversing
changes made to 89950a14ec912d78f44345bd143fab1e0da23804.
Bumping manifests a=b2g-bump