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

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https://hg.mozilla.org/integration/gaia-central/rev/a313750e076b
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #17200 from etiennesegonzac/bug-947131-dsds-call-log-display

Bug 947131 - Show the SIM that was used in the call log for DSDS devices r=ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/75f0c297b2c6
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 947131 - Show the SIM that was used in the call log for DSDS devices.

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https://hg.mozilla.org/integration/gaia-central/rev/1d610612ae78
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #17071 from fcampo/contact-settings-options-shuffled-975618

Bug 975618 - ImportLive and ImportGmail options are shuffled

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https://hg.mozilla.org/integration/gaia-central/rev/76284492a512
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 975618 - ImportLive and ImportGmail options are shuffled
Bumping manifests a=b2g-bump