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

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https://hg.mozilla.org/integration/gaia-central/rev/6e64a200a1f8
Author: Borja Salguero <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #21234 from borjasalguero/webcontacts_contact

Bug 1032871 - [Contacts] There is no way to pick a contact with filter '...

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https://hg.mozilla.org/integration/gaia-central/rev/2dc62c0f2be9
Author: borjasalguero <fbsc@tid.es>
Desc: Bug 1032871 - [Contacts] There is no way to pick a contact with filter 'webcontacts/contact' r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/74b9913cae20
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21359 from KevinGrandon/bug_1034202_vertical_app_resume_intermittent

Bug 1034202 - [Vertical] Intermittent failing test, Vertical Home - Packaged App Update resume update

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https://hg.mozilla.org/integration/gaia-central/rev/6a18ee2a7c72
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1034202 - [Vertical] Intermittent failing test, Vertical Home - Packaged App Update resume update r=me

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https://hg.mozilla.org/integration/gaia-central/rev/cb6e3b0f87e4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21302 from KevinGrandon/bug_1033465_collection_readd_pinned

Bug 1033465 - [Vertical Homescreen] Cant add pinned sites to a smart collection

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https://hg.mozilla.org/integration/gaia-central/rev/bca27c6c124c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1033465 - [Vertical Homescreen] Cant add pinned sites to a smart collection r=crdlc
Bumping manifests a=b2g-bump