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

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https://hg.mozilla.org/integration/gaia-central/rev/18c60c139d73
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25707 from KevinGrandon/bug_1092283_lower_max_runtime

Bug 1092283 - Use 30 minutes max runtime

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https://hg.mozilla.org/integration/gaia-central/rev/c9b6c190a0f2
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1092283 - Use 30 minutes max runtime r=lightsofapollo

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https://hg.mozilla.org/integration/gaia-central/rev/22ccc3daf9e3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25592 from KevinGrandon/bug_1090562_missing_rocketbar_transitions

Bug 1090562 - [Rocketbar] Implement transitions again

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https://hg.mozilla.org/integration/gaia-central/rev/ab95ae464413
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1090562 - [Rocketbar] Implement transitions again r=etienne
Bumping manifests a=b2g-bump