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

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https://hg.mozilla.org/integration/gaia-central/rev/d0262401339c
Author: tamarahills <thills@mozilla.com>
Desc: Merge pull request #24707 from tamarahills/bugfix/1068109

Bug 1068109 - Restore 2s delay before callscreen is closed.

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https://hg.mozilla.org/integration/gaia-central/rev/e3481eed4eed
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1068109 - Restore 2s delay before callscreen is closed.
Bumping manifests a=b2g-bump