ProcessRulesetBrokenRulesetTest: more tweaks for different libxml output

Looks like there are some more libxml quirks to take into account with different message content on different OSes.

This updates the tests to allow for them to pass on PHP < 8.0 with libxml 2.9.x on Windows.

Also adds the `@group Windows` annotation to ensure these tests are also run on Windows in CI.

Author: jrfnl

tests/Core/Ruleset/ProcessRulesetBrokenRulesetTest.php

@@ -21,7 +21,9 @@
  * (duplicate error messages).
  *
  * @runTestsInSeparateProcesses
- * @preserveGlobalState         disabled
+ * @preserveGlobalState         disabled
+ *
+ * @group Windows
  *
  * @covers \PHP_CodeSniffer\Ruleset::processRuleset
  */
@@ -60,7 +62,7 @@ public function testBrokenRulesetSingleError()
         $config   = new ConfigDouble(["--standard=$standard"]);
 
         $regex  = '`^ERROR: Ruleset \S+ProcessRulesetBrokenRulesetSingleErrorTest\.xml is not valid\R';
-        $regex .= '- On line 3, column 1: Premature end of data in tag ruleset line 2\R$`';
+        $regex .= '- On line 3, column 1: (Premature end of data in tag ruleset line 2|EndTag: \'</\' not found)\R$`';
 
         $this->expectRuntimeExceptionRegex($regex);
 
@@ -81,8 +83,8 @@ public function testBrokenRulesetMultiError()
 
         $regex  = '`^ERROR: Ruleset \S+ProcessRulesetBrokenRulesetMultiErrorTest\.xml is not valid\R';
         $regex .= '- On line 8, column 12: Opening and ending tag mismatch: property line 7 and rule\R';
-        $regex .= '- On line 10, column 11: Opening and ending tag mismatch: properties line 5 and ruleset\R';
-        $regex .= '(- On line 11, column 1: Premature end of data in tag rule line 4\R)?$`';
+        $regex .= '- On line 10, column 11: Opening and ending tag mismatch: properties line (5|7) and ruleset\R';
+        $regex .= '(- On line 11, column 1: (Premature end of data in tag rule line 4|EndTag: \'</\' not found)\R)?$`';
 
         $this->expectRuntimeExceptionRegex($regex);