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

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https://hg.mozilla.org/integration/gaia-central/rev/76ae7a4140ab
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #24514 from crh0716/1074103

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

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https://hg.mozilla.org/integration/gaia-central/rev/7ad6c0240971
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