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

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https://hg.mozilla.org/integration/gaia-2_1/rev/64553681e793
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #26422 from mikehenrty/bug-1104235-use-lockscreen-window-manager

Bug 1104235 - Use LockscreenWindowManager instead of lib/lockscreen

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https://hg.mozilla.org/integration/gaia-2_1/rev/0381da1503ec
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1104235 - Use LockscreenWindowManager instead of lib/lockscreen, r=kgrandon, a=test-only
Bumping manifests a=b2g-bump