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

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https://hg.mozilla.org/integration/gaia-2_1/rev/26bed9ec2661
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #25021 from albertopq/2.1-1071706

Bug 1071706 - Dark icons on lockscreen

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https://hg.mozilla.org/integration/gaia-2_1/rev/0a91ad8c37fb
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1071706 - Dark icons on lockscreen

Conflicts:
	tests/atoms/gaia_lock_screen.js
Bumping manifests a=b2g-bump