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

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https://hg.mozilla.org/integration/gaia-central/rev/881038f488f7
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #22459 from timdream/keyboard-mousemove

Bug 1047976 - Ignore mousemove event if mouse button is not pressed, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/0df6d905ae0b
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1047976 - Ignore mousemove event if mouse button is not pressed
Bumping manifests a=b2g-bump