Tests: Replace some occurrences of assertEquals() with assertSame().

This ensures that not only the return values match the expected results, but also that their type is the same.

Props costdev, desrosj.
See #55654.
Built from https://develop.svn.wordpress.org/trunk@54402


git-svn-id: http://core.svn.wordpress.org/trunk@53961 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-beta3-54401';
+$wp_version = '6.1-beta3-54402';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.