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

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https://hg.mozilla.org/integration/gaia-central/rev/5419fe46ec99
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23972 from mikehenrty/bug-1052241-revert-statusbar-setting

Revert "Bug 1052241 - Disable network activity icon in DEBUG mode"

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https://hg.mozilla.org/integration/gaia-central/rev/b4f07777120e
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Bug 1052241 - Disable network activity icon in DEBUG mode"

This reverts commit bcc84b7dcb3be974ca7a329f1aa63c9cfb1c4f91.

Conflicts:
	apps/system/js/statusbar.js

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https://hg.mozilla.org/integration/gaia-central/rev/21e8f02a9f64
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #24068 from 6a68/bug-1065632-fxa-fte-reword

Bug 1065632 - Reword FxA description in FTE flow. r=sfoster

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https://hg.mozilla.org/integration/gaia-central/rev/70c7859cba9a
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1065632 - Reword FxA description in FTE flow. r=sfoster

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https://hg.mozilla.org/integration/gaia-central/rev/53c906d2b99f
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #24064 from mcav/mutex-release

Bug 1065167 - [email] The contents of the outbox won't show until any ac... r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/109259f4d241
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 1065167 - [email] The contents of the outbox won't show until any active sending process completes due to held mutex by sending process. r=asuth
Bumping manifests a=b2g-bump