Tests: Ignore EOL differences in Style Engine API tests.

Unix vs. Windows EOL style mismatches can cause misleading failures in tests using the heredoc syntax (`<<<`) or multiline strings as the expected result.

This resolves two failures when running the test suite on Windows along the lines of:
{{{
1) Tests_Style_Engine_wpStyleEngineCSSRule::test_should_prettify_css_rule_output
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
 #Warning: Strings contain different line endings!
-'.baptiste {
-       margin-left: 0;
-       font-family: Detective Sans;
+'.baptiste {
+       margin-left: 0;
+       font-family: Detective Sans;
}'

/var/www/tests/phpunit/tests/style-engine/wpStyleEngineCssRule.php:159
}}}

Follow-up to [46612], [48443], [48466], [49691], [51135], [53282], [53319], [54156].

See #56467, #55652.
Built from https://develop.svn.wordpress.org/trunk@54394


git-svn-id: http://core.svn.wordpress.org/trunk@53953 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-beta3-54393';
+$wp_version = '6.1-beta3-54394';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.