[Aikido] Fix security issue in google.golang.org/grpc via minor version upgrade from 1.83.1 to 1.83.2

[aikido-autofix]

Upgrade gRPC-Go to fix DoS vulnerability in xDS servers where missing :authority and Host headers cause server panic and complete outage.

✅ 1 CVE resolved by this upgrade

This PR will resolve the following CVEs:

Issue	Severity	Description
CVE-2026-84445	HIGH	[google.golang.org/grpc] xDS-configured gRPC servers panic when receiving requests without :authority or Host headers, causing server crash and denial of service. The vulnerability affects servers with insecure/standard TLS; mTLS/ALTS deployments require valid transport credentials to exploit.

🔗 Related Tasks

• https://theplanttokyo.atlassian.net/browse/QOR5-4795
• https://theplanttokyo.atlassian.net/browse/MAINT-1627

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