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

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https://hg.mozilla.org/integration/gaia-2_1/rev/508805dffb8e
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #24699 from chirarobert/uplift_email_fix

Bug 1074144 - Fix Email app oauth2 authentication failure

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https://hg.mozilla.org/integration/gaia-2_1/rev/9fe91d2e146a
Author: Robert Chira <robertchira@P5075.(none)>
Desc: Bug 1074144 - Fix Email app oauth2 authentication failure
Bumping manifests a=b2g-bump