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Allowlist (whitelist) Upstash IP addresses

For security purposes, some external services may require adding the upstash IP addresses to be listed in their systems. Here is the complete IP list that Upstash will send traffic from: 
52.48.149.7
52.213.40.91
174.129.75.41
34.195.190.47
52.58.175.235
18.158.44.120
63.34.151.162
54.247.137.96
3.78.151.126
3.124.80.204
34.236.200.33
44.195.74.73