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

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https://hg.mozilla.org/integration/gaia-central/rev/2900811db128
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #17086 from etiennesegonzac/bug-946874-sim-on-callscreen

Bug 946874 - Display the SIM in use on the call screen for DSDS devices. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/94132660448d
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 946874 - Display the SIM in use on the call screen for DSDS devices.
r=rik
Bumping manifests a=b2g-bump