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

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https://hg.mozilla.org/integration/gaia-central/rev/2cbbf8fbe5ac
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #26408 from gasolin/master

Revert "Merge pull request #25791 from gasolin/issue-1089511-3"

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https://hg.mozilla.org/integration/gaia-central/rev/79f818a4dce5
Author: gasolin <gasolin@gmail.com>
Desc: Revert "Merge pull request #25791 from gasolin/issue-1089511-3"

This reverts commit 60d2ad46dcd3c608b1ebbc885f17216c507a204c, reversing
changes made to 929a3e9be64ec0d685ae75efbd4aaa4d7fd7cc08.
Bumping manifests a=b2g-bump