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

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https://hg.mozilla.org/integration/gaia-central/rev/c5f8db7e1e71
Author: gitmai <mri@tid.es>
Desc: Merge pull request #15555 from gitmai/bug-961742-CC-VIVO-cfg-not-detect-only-one-decimal

Bug 961742 -[Cost Control] Check balance with Brazil VIVO prepaid SIM ca..
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/c084b4c0cebd
Author: mai <mri@tid.es>
Desc: Bug 961742 -[Cost Control] Check balance with Brazil VIVO prepaid SIM card is not detected if it only has a decimal digit
Bumping manifests a=b2g-bump