remove test made redundant in Go 1.26.1 by golang/go#77578

Author: cfryanr

internal/endpointaddr/endpointaddr_test.go

@@ -1,4 +1,4 @@
-// Copyright 2021-2024 the Pinniped contributors. All Rights Reserved.
+// Copyright 2021-2026 the Pinniped contributors. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
 package endpointaddr
@@ -321,13 +321,6 @@ func TestParseFromURL(t *testing.T) {
 			expect:         HostPort{Host: "0:0:0:0:0:0:0:1", Port: 443},
 			expectEndpoint: "[0:0:0:0:0:0:0:1]:443",
 		},
-		{
-			name:           "IPv6 with mismatched leading bracket will err on bracket",
-			input:          "https://[[::1]/some/fake/path",
-			defaultPort:    443,
-			expect:         HostPort{Host: "::1", Port: 443},
-			expectEndpoint: "[::1]:443",
-		},
 	} {
 		t.Run(tt.name, func(t *testing.T) {
 			urlToProcess, err := url.Parse(tt.input)