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

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https://hg.mozilla.org/integration/gaia-central/rev/f94c21efd153
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #16905 from Rik/sim-notification-wording-979453

Bug 979453 -  Change DualSIM notification from "SIM 1 -" to "(SIM 1)" r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/e6c4a20d93b3
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 979453 -  Change DualSIM notification from "SIM 1 -" to "(SIM 1)"
Bumping manifests a=b2g-bump