test: update test cases

Author: WeihanLi

src/Middleware/HttpOverrides/test/ForwardedHeadersMiddlewareTest.cs

@@ -1072,7 +1072,7 @@ public async Task PartiallyEnabledForwardsPartiallyChangesRequest()
     [InlineData("22.33.44.55,::ffff:172.123.142.121", "172.123.142.121", "", "22.33.44.55")]
     [InlineData("22.33.44.55,::ffff:172.123.142.121", "::ffff:172.123.142.121", "", "22.33.44.55")]
     [InlineData("22.33.44.55,::ffff:172.123.142.121,172.32.24.23", "", "172.0.0.0/8", "22.33.44.55")]
-    [InlineData("2a00:1450:4009:802::200e,2a02:26f0:2d:183::356e,::ffff:172.123.142.121,172.32.24.23", "", "172.0.0.0/8,2a02:26f0:2d:183::/64", "2a00:1450:4009:802::200e")]
+    [InlineData("2a00:1450:4009:802::200e,2a02:26f0:2d:183::356e,::ffff:172.123.142.121,172.32.24.23", "", "172.0.0.0/8,2a02:26f0:2d:183::1/64", "2a00:1450:4009:802::200e")]
     [InlineData("22.33.44.55,2a02:26f0:2d:183::356e,::ffff:127.0.0.1", "2a02:26f0:2d:183::356e", "", "22.33.44.55")]
     public async Task XForwardForIPv4ToIPv6Mapping(string forHeader, string knownProxies, string knownNetworks, string expectedRemoteIp)
     {

src/Middleware/HttpOverrides/test/IPNetworkTest.cs

@@ -4,6 +4,7 @@
 
 namespace Microsoft.AspNetCore.HttpOverrides;
 
+[System.Obsolete]
 public class IPNetworkTest
 {
     [Theory]