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

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https://hg.mozilla.org/integration/gaia-central/rev/a2d2b614eecc
Author: tamarahills <thills@mozilla.com>
Desc: Merge pull request #26083 from tamarahills/bugfix/1068093v3

Bug 1068093 - Remove legacy transition code from the callscreen

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https://hg.mozilla.org/integration/gaia-central/rev/0f497109a32c
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1068093 - Remove legacy transition code from the callscreen.  r=drs
Bumping manifests a=b2g-bump