Tests: Ignore EOL differences in a `wpautop()` test for `<math>` block elements.

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

This commit resolves a failure when running the test suite on Windows:
{{{
1) Tests_Formatting_wpAutop::test_skip_block_math_elements
Failed asserting that two strings are identical.
...
#Warning: Strings contain different line endings!
}}}

Follow-up to [55272].

Props davidbaumwald, ignatggeorgiev, sakibmd.
Fixes #57718.
Built from https://develop.svn.wordpress.org/trunk@55445


git-svn-id: http://core.svn.wordpress.org/trunk@54978 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-beta3-55444';
+$wp_version = '6.2-beta3-55445';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.