Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4f307a26ba9f
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #20789 from jmcanterafonseca/fix_date_birthday

Bug 1027867 - [B2G][Contacts] When editing a contact, the Birthday and A...

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https://hg.mozilla.org/integration/gaia-central/rev/98de125518d6
Author: José Manuel Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1027867 - [B2G][Contacts] When editing a contact, the Birthday and Anniversary dropdowns say 'Date' instead of the date that was selected when creating the contact

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https://hg.mozilla.org/integration/gaia-central/rev/8fdf8c041029
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #20801 from jmcanterafonseca/fix_sim_dups_another

Bug 1028106 - Invalid information of automated merged contacts and conta...

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https://hg.mozilla.org/integration/gaia-central/rev/5b5ae8543313
Author: José Manuel Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1028106 - Invalid information of automated merged contacts and contact duplicate
Bumping manifests a=b2g-bump