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

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https://hg.mozilla.org/integration/gaia-central/rev/7371ed4eea39
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #15097 from askeing/957541

Bug 957541 - Unxfail test_cost_control_reset_wifi.py

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https://hg.mozilla.org/integration/gaia-central/rev/24a36ce049e5
Author: askeing <askeing@gmail.com>
Desc: Bug 957541 - Unxfail test_cost_control_reset_wifi.py