Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7448e582578f
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #23527 from gaye/calendar-modularization-2-force-gaia-try"

This reverts commit 2991746d61bae865f6e0c0dfacda07ae3c2f2fbd, reversing
changes made to 21c2f4b81ef43cdb47e1c7703bb0266d6a17603a.
Bumping manifests a=b2g-bump