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

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https://hg.mozilla.org/integration/gaia-central/rev/23649b3d4be4
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #25257 from zacc/bug_1079742_v2

Bug 1079742 - Test after test_a11y_ftu_desktopb2g is always failing (rel...

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https://hg.mozilla.org/integration/gaia-central/rev/3d7443c17306
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1079742 - Test after test_a11y_ftu_desktopb2g is always failing (relanding after change in manifest file used on TBPL)
Bumping manifests a=b2g-bump