Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/88562261eeee
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Merge pull request #17744 from ian-liu/system2/bug964653_system_dialog_refactor"

This reverts commit 09fe38e11a1979567838bfbadb5122af61ae8dcf, reversing
changes made to e9442b73fd5c01c366457b9a4d52387453615f1e.

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https://hg.mozilla.org/integration/gaia-central/rev/edee16b51277
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #17696 from jmcanterafonseca/fix_bday_date_2

Bug 988399 - [B2G][Contacts] Contacts birthday set to January first inco...

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https://hg.mozilla.org/integration/gaia-central/rev/97bed6d76dc6
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 988399 - [B2G][Contacts] Contacts birthday set to January first incorrectly shows previous year
Bumping manifests a=b2g-bump