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

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https://hg.mozilla.org/integration/gaia-central/rev/7cfd39b4164a
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26187 from huchengtw-moz/bug-1100282-lock-configure-activity

Bug 1100282 - [Stingray][System] only allow smart-settings app to handle..., r=rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/ee061d839814
Author: John Hu <johu@mozilla.com>
Desc: Bug 1100282 - [Stingray][System] only allow smart-settings app to handle configure activity

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https://hg.mozilla.org/integration/gaia-central/rev/39c1880f4697
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26178 from huchengtw-moz/bug-1098663-rename-system

Bug 1098663 - [Stingray][System] Rename System to Services to prevent co..., r=rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/a7b89f03fc10
Author: John Hu <johu@mozilla.com>
Desc: Bug 1098663 - [Stingray][System] Rename System to Services to prevent conflict with ES6
Bumping manifests a=b2g-bump