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

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https://hg.mozilla.org/integration/gaia-central/rev/24e357174f2a
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #19423 from ethantseng/bug-1000340-fix

Bug 1000340 - Remove obsolete codes to launch video app for RTSP, r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/6f0db65233c6
Author: Ethan Tseng <ettseng@mozilla.com>
Desc: Bug 1000340 - Follow-up of 992568 - Remove obsolete codes to launch video app for RTSP
Bumping manifests a=b2g-bump