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

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https://hg.mozilla.org/integration/gaia-2_0/rev/23cff4b7728a
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #21949 from justindarc/bug1037383-v2.0

Bug 1037383 - [QRD 256MB] Delay of 4-6 sec observed while playing record...

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https://hg.mozilla.org/integration/gaia-2_0/rev/e99ad3312050
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1037383 - [QRD 256MB] Delay of 4-6 sec observed while playing recorded video for the first time
Bumping manifests a=b2g-bump