Revert "Merge main"

This reverts commit 89f95b15482030ed9d3aee8d3caab68c65f43055.

client/internal/auth/pkce_flow.go

@@ -360,13 +360,7 @@ func isRedirectURLPortUsed(redirectURL string, excludedRanges []excludedPortRang
 		return true
 	}
 
-	// FreeBSD 15 disables connecting to INADDR_ANY (0.0.0.0) as a localhost
-	// alias by default, ensure explicit ip for localhost.
-	host := parsedURL.Hostname()
-	if host == "" {
-		host = "127.0.0.1"
-	}
-	addr := net.JoinHostPort(host, port)
+	addr := fmt.Sprintf(":%s", port)
 	conn, err := net.DialTimeout("tcp", addr, 3*time.Second)
 	if err != nil {
 		return false