Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f873a6c302e4
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #24825 from gtorodelvalle/callscreen-bug-977056-participant-leaving-conference

Bug 977056 - [Dialer] Visual discrepancies: Call ended view under conference call participants list

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https://hg.mozilla.org/integration/gaia-central/rev/0df4167a2978
Author: German Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 977056 - [Dialer] Visual discrepancies: Call ended view under conference call participants list

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https://hg.mozilla.org/integration/gaia-central/rev/90ded75718f2
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #25671 from DouglasSherk/1045820-sim-picker-dialer

Bug 1045820 - Port SimPicker implementation in MSAB and comms apps to GaiaSimPicker. r=gtorodelvalle, r=julienw, r=jmcf, r=rickychien

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https://hg.mozilla.org/integration/gaia-central/rev/6292b6cf5de3
Author: Doug Sherk <github@sherk.me>
Desc: Bug 1045820 - Port SimPicker implementation in MSAB and comms apps to GaiaSimPicker. r=gtorodelvalle, r=julienw, r=jmcf, r=rickychien
Bumping manifests a=b2g-bump