Tests: Consistently sanitize expiration in the test suite's Memcached implementation.

In a previous commit, the `::sanitize_expiration()` call in the `::add()` method was moved closer to where the value is used.

This commit does the same for the other methods:
* `::cas()`
* `::replace()`
* `::set()`
* `::setMulti()`

Follow-up to [40561], [55577].

See #57841, #57963.
Built from https://develop.svn.wordpress.org/trunk@55581


git-svn-id: http://core.svn.wordpress.org/trunk@55093 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55580';
+$wp_version = '6.3-alpha-55581';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.