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

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https://hg.mozilla.org/integration/gaia-central/rev/900704edb7d0
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #22930 from arcturus/bug-1035760

Bug 1035760 - [B2G][Contacts] support 24 hour time format r=sergi

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https://hg.mozilla.org/integration/gaia-central/rev/b5e23a70a831
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1035760 - [B2G][Contacts] support 24 hour time format r=sergi

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https://hg.mozilla.org/integration/gaia-central/rev/8096d964b805
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #21401 from michalbe/Bug1034405

Bug 1034405 - [NFC] Sharing contact imported by NFC

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https://hg.mozilla.org/integration/gaia-central/rev/e61fb77c239c
Author: Michal Budzynski <michal@virtualdesign.pl>
Desc: Bug 1034405 - [NFC] :zap: Sharing contact imported by NFC
Bumping manifests a=b2g-bump