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

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https://hg.mozilla.org/integration/gaia-central/rev/82b91f190cec
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #23093 from zacc/bug_1050322

Bug 1050322 - In gaia-marionette script, don't download desktopb2g when ...

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https://hg.mozilla.org/integration/gaia-central/rev/f87b4eff7d7e
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1050322 - In gaia-marionette script, don't download desktopb2g when target is device
Bumping manifests a=b2g-bump