Build/Test Tools: Update several GitHub Actions.

This updates three GitHub Actions to their latest versions:
- `shivammathur/setup-php`
- `actions/cache`
- `wow-actions/welcome`

The welcome action now uses the `GITHUB_TOKEN` by default, so it no longer needs to be passed manually.

See #57572.
Built from https://develop.svn.wordpress.org/trunk@55487


git-svn-id: http://core.svn.wordpress.org/trunk@55020 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-beta5-55486';
+$wp_version = '6.2-beta5-55487';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.