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

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https://hg.mozilla.org/integration/gaia-central/rev/84b1da2e23a8
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #21694 from lissyx/bug1038115

Bug 1038115 - Fix FindMyDevice customization resources r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/9a2e7761ec76
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 1038115 - Fix FindMyDevice customization resources
Bumping manifests a=b2g-bump