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

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https://hg.mozilla.org/integration/gaia-central/rev/07b71c055adc
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #17326 from azasypkin/sms

Bug 962659 - [B2G][Contacts] Adjust Remove and Cancel button's position and style in contact deletion confirm for better use experience. r=schung.

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https://hg.mozilla.org/integration/gaia-central/rev/a9a9d800857b
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 962659 - [B2G][Contacts] Adjust Remove and Cancel button's position and style in contact deletion confirm for better use experience.
Bumping manifests a=b2g-bump