fix: error when filling in the HTTP proxy address in IPv6 format (#77260, fixes #77259)

src/vs/platform/request/common/request.ts

@@ -69,7 +69,7 @@ Registry.as<IConfigurationRegistry>(Extensions.Configuration)
 		properties: {
 			'http.proxy': {
 				type: 'string',
-				pattern: '^https?://([^:]*(:[^@]*)?@)?([^:]+)(:\\d+)?/?$|^$',
+				pattern: '^https?://([^:]*(:[^@]*)?@)?([^:]+|\\[[:0-9a-fA-F]+\\])(:\\d+)?/?$|^$',
 				markdownDescription: localize('proxy', "The proxy setting to use. If not set, will be inherited from the `http_proxy` and `https_proxy` environment variables.")
 			},
 			'http.proxyStrictSSL': {