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

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https://hg.mozilla.org/integration/gaia-central/rev/24f50300e31d
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #19050 from gasolin/issue-959052

Bug 959052 - [NFC] rotating of shrink UI is wrong, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/4a0b6df8acc1
Author: gasolin <gasolin@gmail.com>
Desc: Bug 959052 - [NFC] rotating of shrink UI is wrong
Bumping manifests a=b2g-bump