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

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https://hg.mozilla.org/integration/gaia-2_1/rev/6a155d3a8e06
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #24605 from jmcanterafonseca/position_ice_contacts_21

Bug 1069974 - [Contacts] [ICE] Deleting ICE Contact 1 makes ICE Contact ...

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https://hg.mozilla.org/integration/gaia-2_1/rev/ff43b4380d72
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1069974 - [Contacts] [ICE] Deleting ICE Contact 1 makes ICE Contact 2 to promote to position 1(cherry picked from commit 84c9fcb8c846203ede478c05886ef9fff9384f79)
Bumping manifests a=b2g-bump