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

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https://hg.mozilla.org/integration/gaia-central/rev/a4e53e1001f2
Author: Marshall Culpepper <marshall.law@gmail.com>
Desc: Merge pull request #20106 from marshall/bug995434_ftuPingSimLocked_master

Bug 999053: [FTU Ping] Handle multisim situations more gracefully when collecting network info

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https://hg.mozilla.org/integration/gaia-central/rev/b46ac200fb89
Author: Marshall Culpepper <marshall@mozilla.com>
Desc: Bug 999053: [FTU Ping] Handle multisim situations more gracefully when collecting network info. r=fabrice

Conflicts:

	apps/system/test/unit/ftu_ping_test.js

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https://hg.mozilla.org/integration/gaia-central/rev/fc307ae1c820
Author: gitmai <mri@tid.es>
Desc: Merge pull request #19628 from gitmai/bug-1007588-CC-iac-with-sms

Bug 1007588 -[Cost Control] Implement an IAC mechanism to warn other app...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/5b43cbc7469c
Author: mai <mri@tid.es>
Desc: Bug 1007588 -[Cost Control] Implement an IAC mechanism to warn other applications about sending a SMS for requiring balance or making a SMS top-up
Bumping manifests a=b2g-bump