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

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https://hg.mozilla.org/integration/gaia-central/rev/c05b5eccb8a5
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #15671 from cctuan/962938

Bug 962938 - Inconsistent file path in zip file

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https://hg.mozilla.org/integration/gaia-central/rev/21be3355e239
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 962938 - Inconsistent file path in zip file
Bumping manifests a=b2g-bump