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

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https://hg.mozilla.org/integration/gaia-2_1/rev/7f8d6a596ad4
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #26145 from bebef1987/fix_email

Bug 1090281 - Investigate failure in test_setup_and_send_imap_email.py

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https://hg.mozilla.org/integration/gaia-2_1/rev/3481cdf1d3bc
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1090281 - Investigate failure in test_setup_and_send_imap_email.py
Bumping manifests a=b2g-bump