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

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https://hg.mozilla.org/integration/gaia-2_0/rev/e15876249c41
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #23692 from asutherland/email-mitigate-less-secure

Bug 1059100 - [email] 2.0-specific XOAuth2 mitigation, tracked in bug 1065846 r=asuth,jrburke a=bajaj

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https://hg.mozilla.org/integration/gaia-2_0/rev/0317d0c9e715
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1065846 - [email][v2.0] v2.0-specific GMail less secure apps mitigation
Bumping manifests a=b2g-bump