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

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https://hg.mozilla.org/integration/gaia-central/rev/b7b1e61df18d
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #21449 from AndreiH/bug_1035136_fix

Bug 1035136 - Intermittent Homescreen UI Tests failures: test_homescreen...

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https://hg.mozilla.org/integration/gaia-central/rev/c7cc6822e81c
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 1035136 - Intermittent Homescreen UI Tests failures: test_homescreen_launch_app.TestLaunchApp.test_launch_app

Bug 1035136 - Intermittent Homescreen UI Tests failures: test_homescreen_launch_app.TestLaunchApp.test_launch_app

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