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

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https://hg.mozilla.org/integration/gaia-central/rev/5f0660e48c26
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #17797 from huchengtw-moz/revert-bug-971554

Revert "Merge pull request #17790 from huchengtw-moz/system2/Bug_971554_...

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https://hg.mozilla.org/integration/gaia-central/rev/babc98c76dcf
Author: John Hu <johu@mozilla.com>
Desc: Revert "Merge pull request #17790 from huchengtw-moz/system2/Bug_971554_reland-master"

This reverts commit eee964fc7e8dc519218dee6b72595ad0f7dd8231, reversing
changes made to bb7285e8f6c70bf10b0affbeb370fc041bdecff8.

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https://hg.mozilla.org/integration/gaia-central/rev/40b59387604d
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #17515 from evanxd/bug-978933

Bug 978933 - gaia-marionette should not care about the order of its environment variables

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https://hg.mozilla.org/integration/gaia-central/rev/b63565562a42
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 978933 - Remove the Radicale CalDAV server installation from gaia-marionette.

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https://hg.mozilla.org/integration/gaia-central/rev/359e9f477abd
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #17357 from EragonJ/bug-973447

Bug 973447 - [settings] refactor Language panel with AMD pattern

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https://hg.mozilla.org/integration/gaia-central/rev/fc588a390f20
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 973447 - [settings] refactor Language panel with AMD pattern
Bumping manifests a=b2g-bump