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

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https://hg.mozilla.org/integration/gaia-2_1/rev/5a00c144712e
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #24482 from DouglasSherk/1073534-callscreen-cancel-v2.1

Bug 1073534 - Include Contacts properties files in Callscreen to get their "cancel" keys. r=Rik

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https://hg.mozilla.org/integration/gaia-2_1/rev/fda5067f3755
Author: Doug Sherk <github@sherk.me>
Desc: Bug 1073534 - Include Contacts properties files in Callscreen to get their "cancel" keys. r=Rik
Bumping manifests a=b2g-bump