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

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https://hg.mozilla.org/integration/gaia-2_0/rev/91cbbc0c4bf0
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #20634 from DouglasSherk/1026081-missed-api

Bug 1026081 - [Dialer] Fix missed telephony API upgrade to TelephonyCallId. r=etienne
Bumping manifests a=b2g-bump