I used to get files like this from Mark Jaquith’s website, but hasn’t released changed files packs for the last couple of upgrades. The zip below contains all files changed from version 2.2.2 to 2.2.3. If you, like me, run several WordPress blogs, uploading the changed files alone can really save lots of time.
Please read (and follow) the upgrade instructions, although this particular upgrade does not require you to run the upgrade.php script. If this doesn’t work for you you’re on your own. It worked just fine for me though :).