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

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https://hg.mozilla.org/integration/gaia-central/rev/6465db998273
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #23764 from tamarahills/bugfix/1060729

Bug 1060729 - Handle default outgoing call SIM set to always ask in ICE contacts. r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/463052b2ba87
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1060729 - Handle default outgoing call SIM set to always ask in ICE contacts. r=drs
Bumping manifests a=b2g-bump