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

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https://hg.mozilla.org/integration/gaia-central/rev/99b622afd668
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #12501 from gitmai/bug-921383-detect-zero-balance-movistar-peru

Bug 921383 - Detect zero balance movistar Peru
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/c31bc75577fb
Author: mai <mri@tid.es>
Desc: Bug 921383 - Detect zero balance movistar peru

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https://hg.mozilla.org/integration/gaia-central/rev/de1752002465
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #12539 from gitmai/bug-912487-cc-message-no-sim

Bug 912487 - Restore message no SIM (CostControl)
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/f52fd1103105
Author: mai <mri@tid.es>
Desc: Bug 912487 - Restore message no SIM (CostControl)