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

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https://hg.mozilla.org/integration/gaia-central/rev/a122d0858ded
Author: Dave Hylands <dhylands@gmail.com>
Desc: Merge pull request #22418 from JonHylands/jhylands-1028261-reference-workload-exit-error-code

Bug 1028261 - Fix to exit with a non-zero code on errors. r=dave.hunt

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https://hg.mozilla.org/integration/gaia-central/rev/0ed9663c70fb
Author: Jon Hylands <jhylands@mozilla.com>
Desc: Bug 1028261 - Fix to exit with a non-zero code on errors
Bumping manifests a=b2g-bump