Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/0b54b7e2cf95
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1063658: workaround memory-backed blob bug 1079546 by ensuring that pick and share activities always use files

Conflicts:
	apps/gallery/index.html
Bumping manifests a=b2g-bump