Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b8275b26a982
Author: gitmai <mri@tid.es>
Desc: Merge pull request #20298 from gitmai/bug-1008987-import-vcard

Bug 1008987 - [Contacts][Merger] Thumbnail on contacts list disappear wh...
r=jmcf

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https://hg.mozilla.org/integration/gaia-central/rev/995c11726c4c
Author: mai <mri@tid.es>
Desc: Bug 1008987 - [Contacts][Merger] Thumbnail on contacts list disappear when importing same vCard/.vcf file several times

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https://hg.mozilla.org/integration/gaia-central/rev/f5049ee5486f
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #20249 from TheoChevalier/patch-3

Bug 1017918 - Add mai (Maithili) to Gaia languages

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https://hg.mozilla.org/integration/gaia-central/rev/4f95c7b62d28
Author: Théo Chevalier <theo.chevalier11@gmail.com>
Desc: Bug 1017918 - Add mai (Maithili) to Gaia languages

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https://hg.mozilla.org/integration/gaia-central/rev/4479cb0315b6
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #19727 from DouglasSherk/1005823-emergency-call

Bug 1005823 - [Dialer] Fix emergency calls with no SIM card. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/00c18f2e8f69
Author: DouglasSherk <github@sherk.me>
Desc: Bug 1005823 - [Dialer] Fix emergency calls with no SIM card. r=rik
Bumping manifests a=b2g-bump