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

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https://hg.mozilla.org/integration/gaia-central/rev/5b01e644891f
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #17703 from jmcanterafonseca/multiple_contact_fb_delete_done

Bug 988243 - Multiple contact delete does not work with Facebook Contact...

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https://hg.mozilla.org/integration/gaia-central/rev/2973645c809e
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 988243 - Multiple contact delete does not work with Facebook Contacts
Bumping manifests a=b2g-bump