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

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https://hg.mozilla.org/integration/gaia-central/rev/58296bb5aae2
Author: Andrew Halberstadt <halbersa@gmail.com>
Desc: Merge pull request #22316 from ahal/runner_service_crash_reporting

Bug 1045142 - Runner service should check_for_crashes on runner_stop, r=...

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https://hg.mozilla.org/integration/gaia-central/rev/7aa56372a5cd
Author: Andrew Halberstadt <halbersa@gmail.com>
Desc: Bug 1045142 - Runner service should check_for_crashes on runner_stop, r=mdas
Bumping manifests a=b2g-bump