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

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https://hg.mozilla.org/integration/gaia-central/rev/73a751e96ae0
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #22041 from EverythingMe/1042080-privacy-branding

Bug 1042080 - [Settings] [EverythingMe] 'Your Privacy' page shows outdated EverythingMe branding

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https://hg.mozilla.org/integration/gaia-central/rev/7454169823ef
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1042080 - [Settings][FTU][EverythingMe] 'Your Privacy' page shows outdated EverythingMe branding r=ranbena
Bumping manifests a=b2g-bump