Convert two source files to UTF-8

The files in this commit have previously contained text encoded as Windows-1252 (commonly mistaken for latin1/ISO-8859-1), in ways that present invalid UTF-8 bytes.

This commit converts the encodings to UTF-8, which resolves the encoding issues. While the whole-posts document could be argued to be intentionally Windows-1252, there was no obvious evidence that this was more than an historic legacy. The JavaScript file, however, definitely ought to be UTF-8.

Developed in https://github.com/WordPress/wordpress-develop/pull/9425
Discussed in https://core.trac.wordpress.org/ticket/63815

Props dmsnell, swisspidy.
Fixes #63815.

Built from https://develop.svn.wordpress.org/trunk@60627


git-svn-id: http://core.svn.wordpress.org/trunk@59963 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/tw-sack.js

@@ -1,5 +1,5 @@
 /* Simple AJAX Code-Kit (SACK) v1.6.1 */
-/* ©2005 Gregory Wild-Smith */
+/* ©2005 Gregory Wild-Smith */
 /* www.twilightuniverse.com */
 /* Software licenced under a modified X11 licence,
    see documentation or authors website for more details */

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-alpha-60626';
+$wp_version = '6.9-alpha-60627';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.