Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/d5741a5d4bc7
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #23996 from jmcanterafonseca/fix_bday

Bug 1066482 - [Contacts] [Regression] Cannot add a new contact with only...

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https://hg.mozilla.org/integration/gaia-central/rev/8cdb519b8d6e
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1066482 - [Contacts] [Regression] Cannot add a new contact with only date (birthday or anniversary)

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https://hg.mozilla.org/integration/gaia-central/rev/73fa125f8eff
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #23868 from wilsonpage/1064315

Bug 1064315 - [camera] Update gaia-header and gaia-icons

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https://hg.mozilla.org/integration/gaia-central/rev/77c228c087ff
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1064315 - [camera] Update gaia-header and gaia-icons

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https://hg.mozilla.org/integration/gaia-central/rev/713107e677b7
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #23860 from wilsonpage/1064903

Bug 1064903 - Update to latest gaia-icons

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https://hg.mozilla.org/integration/gaia-central/rev/2cc0093ba286
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1064903 - Update to latest gaia-icons
Bumping manifests a=b2g-bump