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

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https://hg.mozilla.org/integration/gaia-central/rev/2babb1f06da2
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #22557 from yurenju/callscreen-2

Bug 1000049 - APP=callscreen make install-gaia should restart b2g to pick up the changes r=gduan

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https://hg.mozilla.org/integration/gaia-central/rev/026781dc5142
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1000049 - APP=callscreen make install-gaia should restart b2g to pick up the changes
Bumping manifests a=b2g-bump