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

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https://hg.mozilla.org/integration/gaia-central/rev/7add0c9ece76
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #21024 from shamenchens/Bug1021481-App-Protocol-5

Bug1021481 Handle app protocol for DEBUG=1 mode, r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/f12bff95e780
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1021481 - Handle app protocol for DEBUG=1 mode, with port change
Bumping manifests a=b2g-bump