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

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https://hg.mozilla.org/integration/gaia-central/rev/82c5144d87e8
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #16440 from EragonJ/bug-973512

Bug 973512 - only build once for "marionette_js_stable_check" action

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https://hg.mozilla.org/integration/gaia-central/rev/5ac020c6b058
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 973512 - only build once for "marionette_js_stable_check" action
Bumping manifests a=b2g-bump