Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4baa26a4ad68
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #26031 from zacc/bug_1096928_pt2

Bug 1096928 - Address intermittent in test_add_contact_to_favorites.py

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https://hg.mozilla.org/integration/gaia-central/rev/a6d1d63eefad
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1096928 - Address intermittent in test_add_contact_to_favorites.py

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https://hg.mozilla.org/integration/gaia-central/rev/a861e8da16f9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25013 from KevinGrandon/bug_1080905_rename_system

Bug 1080905 - [System] Rename System to Service r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/212311178f17
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1080905 - [System] Rename System to Service r=alive
Bumping manifests a=b2g-bump