chore(env): update Govulncheck Go version to 1.25.6

Author: mrz1836

.github/.env.base

@@ -39,7 +39,8 @@ GO_SECONDARY_VERSION=1.24.x
 # Govulncheck-specific Go version for vulnerability scanning
 # Uses newer Go version for accurate standard library vulnerability detection
 # Override this in .env.custom if needed for compatibility
-GOVULNCHECK_GO_VERSION=1.25.7
+#GOVULNCHECK_GO_VERSION=1.25.7 (Not in Github yet)
+GOVULNCHECK_GO_VERSION=1.25.6
 
 # ================================================================================================
 # 📦 GO MODULE CONFIGURATION