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

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https://hg.mozilla.org/integration/gaia-central/rev/a734698ab56d
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #19058 from evanxd/bug-963394

Bug 963394 - Visual refresh for event detail page.

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https://hg.mozilla.org/integration/gaia-central/rev/54530ac6431f
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 963394 - Visual refresh for event detail page
Bumping manifests a=b2g-bump