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

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https://hg.mozilla.org/integration/gaia-central/rev/62a37df9c0b4
Author: Sam Foster <sam@sam-i-am.com>
Desc: Merge pull request #22274 from sfoster/bug-1038630-tutorial-redux

 Bug 1038630 - Split Tutorial init into init, start methods. r=fcampo

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https://hg.mozilla.org/integration/gaia-central/rev/ddccecbbe7ce
Author: Sam Foster <sfoster@mozilla.com>
Desc:  Bug 1038630 - Split Tutorial init into init, start methods.

* init early in FTU, call start from 'Get started' button
* Dont wait to loadConfig in ftu AppManager
* Add 1.3..2.1 and 1.4..2.1 upgrade steps for easier testing on master
* Remove unused ensureConfig
* Fix tutorial init/start logic in FTU AppManager
* Add jsdocs for Tutorial
* Remove surplus Tutorial.init call from UIManager
* Update FTU UIManager mock
Bumping manifests a=b2g-bump