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

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https://hg.mozilla.org/integration/gaia-2_0/rev/b72506317f83
Author: Salvador de la Puente <salva@unoyunodiez.com>
Desc: Bug 1054570 - Cursor is set to the beginning of the password field after it has been shown as plain text
Bumping manifests a=b2g-bump