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

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https://hg.mozilla.org/integration/gaia-2_1/rev/fc79717a8c08
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #24746 from crdlc/bug-1073646-v2.1

Bug 1073646 - [Settings] Clear bookmarks data does not work properly

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https://hg.mozilla.org/integration/gaia-2_1/rev/5bf169ef155f
Author: crdlc <crdlc@tid.es>
Desc: Bug 1073646 - [Settings] Clear bookmarks data does not work properly

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https://hg.mozilla.org/integration/gaia-2_1/rev/5d816b754d43
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #24862 from crh0716/1074103_v2.1

Bug 1074103 - Get supported network types every time when navigating to operator settings panel

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https://hg.mozilla.org/integration/gaia-2_1/rev/54ce973d6fe1
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1074103 - Get supported network types every time when navigating to operator settings panel
Bumping manifests a=b2g-bump