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

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https://hg.mozilla.org/integration/gaia-central/rev/9a7dca09500f
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #14429 from snowmantw/issue943237

Bug 943237 - [LockScreen][ScreenReader] Would non-clickable icons break the accessibility on LockScreen

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https://hg.mozilla.org/integration/gaia-central/rev/6697c54f767e
Author: Greg Weng (snowmantw) <gweng@mozilla.com>
Desc: Bug 943237 - [LockScreen][ScreenReader] Would non-clickable icons break the accessibility on LockScreen

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https://hg.mozilla.org/integration/gaia-central/rev/44f7f83d855b
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #13989 from ian-liu/settings/Bug926334_To_support_EAP-SIM_and_WPA-EAP_option_in_WLAN_settin

Bug 926334 - [Gaia] To support WPA-EAP options(PEAP, TLS, TTLS) and manage certificate in WLAN setting. r=@crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/be9617c438c8
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 926334 - [Gaia] To support WPA-EAP options(PEAP, TLS, TTLS) and manage certificate in WLAN setting.