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

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https://hg.mozilla.org/integration/gaia-central/rev/927325d75320
Author: tamarahills <thills@mozilla.com>
Desc: Merge pull request #25370 from tamarahills/bugfix/1081854

Bug 1081854 - GAIA follow-up to Bug 978639 (for GCF case 31.4.2.1.3). r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/9df95be752e3
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1081854: GAIA follow-up to Bug 978639 (for GCF case 31.4.2.1.3). r=drs
Bumping manifests a=b2g-bump