Fix typo: rename InvalidReverseSoldius to InvalidReverseSolidus in Uri\WhatWg\UrlValidationErrorType

The WHATWG URL validation error is invalid-reverse-solidus, and the
underlying Lexbor constant is LXB_URL_ERROR_TYPE_INVALID_REVERSE_SOLIDUS.
The enum case was misspelled as InvalidReverseSoldius (missing 'l').

Changes:
- Fixed enum case spelling in ext/uri/php_uri.stub.php
- Fixed error string mapping in ext/uri/uri_parser_whatwg.c
- Added PHPT test for the correct enum case name

Author: OracleNep

ext/uri/php_uri.stub.php

@@ -153,7 +153,7 @@ enum UrlValidationErrorType
         case InvalidUrlUnit;
         case SpecialSchemeMissingFollowingSolidus;
         case MissingSchemeNonRelativeUrl;
-        case InvalidReverseSoldius;
+        case InvalidReverseSolidus;
         case InvalidCredentials;
         case HostMissing;
         case PortOutOfRange;

ext/uri/tests/invalid_reverse_solidus_enum.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Uri\WhatWg\UrlValidationErrorType uses the correct InvalidReverseSolidus spelling
+--EXTENSIONS--
+uri
+--FILE--
+<?php
+$caseNames = array_map(
+    static fn($case) => $case->name,
+    Uri\WhatWg\UrlValidationErrorType::cases(),
+);
+
+var_dump(in_array('InvalidReverseSolidus', $caseNames, true));
+var_dump(in_array('InvalidReverseSoldius', $caseNames, true));
+?>
+--EXPECT--
+bool(true)
+bool(false)

ext/uri/uri_parser_whatwg.c

@@ -167,7 +167,7 @@ static const char *fill_errors(zval *errors)
 				ZVAL_TRUE(&failure);
 				break;
 			case LXB_URL_ERROR_TYPE_INVALID_REVERSE_SOLIDUS:
-				error_str = "InvalidReverseSoldius";
+				error_str = "InvalidReverseSolidus";
 				ZVAL_FALSE(&failure);
 				break;
 			case LXB_URL_ERROR_TYPE_INVALID_CREDENTIALS: