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

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https://hg.mozilla.org/integration/gaia-2_1/rev/076387ae1da6
Author: KWierso <kwierso@gmail.com>
Desc: Reland "Bug 1082938 - [Music] set play status to playing when play event fires"

This reverts commit 1b231b87aad384842dfc79614b2a9ca68a4b4ff3.

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https://hg.mozilla.org/integration/gaia-2_1/rev/a7ea27e14a47
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25993 from BorisChiou/bug-1091166

Bug 1091166 - Fix the color contrast value when enabling it
Bumping manifests a=b2g-bump