Update staging.zulip.com.crt and combined-chain.

The older certificate had an "Organization: Luke Faraone" which was sub-
optimal. This new certificate is also based on a key that has not been made
available to our app instances in the past.

(imported from commit 0a8070bb16e4c640e6b4c06afee07ccf88495327)

certs/staging.zulip.com.combined-chain.crt

@@ -1,45 +1,38 @@
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 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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certs/staging.zulip.com.crt

@@ -1,43 +1,36 @@
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