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

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https://hg.mozilla.org/integration/gaia-central/rev/4f0c57bbc162
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #26143 from viorelaioia/bug_1098300

Bug 1098300 - [v2.2] Investigate test_dialer_miss_call_from_known_contac...

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https://hg.mozilla.org/integration/gaia-central/rev/43f27526f473
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1098300 - [v2.2] Investigate test_dialer_miss_call_from_known_contact_notification.py intermittent failure
Bumping manifests a=b2g-bump