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

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https://hg.mozilla.org/integration/gaia-central/rev/29fb494ad89d
Author: RickyChien <ricky060709@gmail.com>
Desc: Merge pull request #26807 from RickyChien/bug-991442-follow-up

Bug 991442 - follow-up, update gaia-node-modules.revision r=me

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https://hg.mozilla.org/integration/gaia-central/rev/f29deef3e8c5
Author: RickyChien <ricky060709@gmail.com>
Desc: Bug 991442 - follow-up, update gaia-node-modules.revision

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https://hg.mozilla.org/integration/gaia-central/rev/2c14e0e7f658
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #26798 from KevinGrandon/bug_1111494_gaia_confirm_title_height

Bug 1111494 - [GaiaConfirm] Allow multiple header lines in confirm r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/d6d997498850
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1111494 - [GaiaConfirm] Allow multiple header lines in confirm

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https://hg.mozilla.org/integration/gaia-central/rev/1df6db33e760
Author: RickyChien <ricky060709@gmail.com>
Desc: Merge pull request #25015 from RickyChien/bug-991442

Bug 991442 - Add coverage threshold to test-agent r=@julienw

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https://hg.mozilla.org/integration/gaia-central/rev/4b327a7a6260
Author: RickyChien <ricky060709@gmail.com>
Desc: Bug 991442 - Add coverage threshold to test-agent
Bumping manifests a=b2g-bump