Dependency Upgrades / CVE fixes
Upgraded Golang to version 1.26.3 and updated several Go dependencies, including google.golang.org/grpc, golang.org/x/crypto, and golang.org/x/oauth2, to remediate security vulnerabilities (CVE-2026-33186, CVE-2024-45337, CVE-2026-27143, CVE-2025-68121, CVE-2025-22871, CVE-2026-32283, CVE-2025-61725, and CVE-2025-22868).