Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/26fc327d20da
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 959344 - Disable test_settings_gps.py due to intermittency a=testonly
Bumping manifests a=b2g-bump