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

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https://hg.mozilla.org/integration/gaia-2_1/rev/8c66d29e570f
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #24899 from etiennesegonzac/bug-1079379

Bug 1079379 - Decode the screenshots "as we go" while edge swiping. r=aus
(cherry picked from commit 76122f7ba317cf2aa7a091cb4512ca8ce69335b9)

Conflicts:
	apps/system/js/app_window.js
	apps/system/test/unit/app_window_test.js
Bumping manifests a=b2g-bump