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

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https://hg.mozilla.org/integration/gaia-central/rev/b810b68a8db1
Author: Rob Wood <rwood@mozilla.com>
Desc: Merge pull request #26416 from rwood-moz/bug1095080

Bug 1095080 - Fix browser endurance tests

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https://hg.mozilla.org/integration/gaia-central/rev/f6cf8d26719e
Author: Rob Wood <rwood@mozilla.com>
Desc: Bug 1095080 - Fix browser endurance tests
Bumping manifests a=b2g-bump