Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/084bee53f04f
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #18539 from benfrancis/997920

Bug 997920 - Deactivate Rocketbar with cancel button r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/2df999803e31
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 997920 - Deactivate Rocketbar with cancel button

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https://hg.mozilla.org/integration/gaia-central/rev/e18df3baf2f5
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #18376 from rnowm/997084

Bug 997084 - [Cost Control] remove temporal styles and link to [BB] r=marina

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https://hg.mozilla.org/integration/gaia-central/rev/3c8adbd0bfc4
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 997084 - [Cost Control] remove temporal styles and link to [BB]
Bumping manifests a=b2g-bump