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

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https://hg.mozilla.org/integration/gaia-2_0/rev/a89c5466b3ae
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #21804 from gtorodelvalle/v2.0-bug-1018283-uplifting

[v2.0 UPLIFT] Bug 1018283 - [Follow-up 951665] Pending visual revision and adjustments of the VR call screen when in lockscreen

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https://hg.mozilla.org/integration/gaia-2_0/rev/33ae1f23de25
Author: German Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 1018283 - [Follow-up 951665] Pending visual revision and adjustments of the VR call screen when in lockscreen
Bumping manifests a=b2g-bump