Editor: Ignore built assets introduced in WordPress 6.9, SVN edition.

Update the `svn:ignore` property for newly introduced assets in the `src/wp-includes/blocks` directory. 

The code run for this commit was:

{{{
cd src/wp-includes/blocks
svn propset svn:ignore '*.js.map
*.js
*.css' . --recursive
}}}

Follow up to [61012].

See #64117.

Built from https://develop.svn.wordpress.org/trunk@61042


git-svn-id: http://core.svn.wordpress.org/trunk@60378 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-beta1-61041';
+$wp_version = '6.9-beta1-61042';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.