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

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https://hg.mozilla.org/integration/gaia-central/rev/f5ec2da0b4da
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #16636 from wilsonpage/bug/975192

Bug 975192 - [B2G][Camera] No option to cancel out of taking a new photo...

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https://hg.mozilla.org/integration/gaia-central/rev/73ad3fad8490
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 975192 - [B2G][Camera] No option to cancel out of taking a new photo for a contact
Bumping manifests a=b2g-bump