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

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https://hg.mozilla.org/integration/gaia-central/rev/1e26d96f8d46
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #16031 from jmcanterafonseca/fix_gmail

Bug 962377 - [B2G][Contacts] User is unable to sign out of a gmail accou...

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https://hg.mozilla.org/integration/gaia-central/rev/b0b2d73ffa28
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 962377 - [B2G][Contacts] User is unable to sign out of a gmail account and in to another after importing contacts.
Bumping manifests a=b2g-bump