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

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https://hg.mozilla.org/integration/gaia-2_1/rev/c264505418d6
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #24324 from snowmantw/issue1065262-v2.1

Bug 1065262 - [Lockscreen] No action is triggered on notification in loc...

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https://hg.mozilla.org/integration/gaia-2_1/rev/db38f87f3c5b
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1065262 - [Lockscreen] No action is triggered on notification in lock screen with passcode enabled
Bumping manifests a=b2g-bump