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

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https://hg.mozilla.org/integration/gaia-central/rev/c758727ab927
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #24248 from ddrmanxbxfr/bug_1056481

Bug 1056481 - Update reference to CDN to HTTPS, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/88314f2d7891
Author: Mathieu Rhéaume <mathieu@codingrhemes.com>
Desc: Bug 1056481 - Update reference to CDN to HTTPS
Bumping manifests a=b2g-bump