Fixing php53-redis file hash

The file hash of what is downloaded from the phpredis tarball and what is in the forumla do not match. 

 └╼ brew upgrade
==> Upgrading 1 outdated package, with result:
php53-redis 2.2.3
==> Upgrading php53-redis
==> Downloading https://github.com/nicolasff/phpredis/tarball/2.2.3
Already downloaded: /Library/Caches/Homebrew/php53-redis-2.2.3.tgz
Error: SHA1 mismatch
Expected: 84480a8c494f14eee7bb295e5a6dbdb9185f487b
Actual: b59e19aa06209ca5c366e1e0a3ce4479473df8f3
Archive: /Library/Caches/Homebrew/php53-redis-2.2.3.tgz
(To retry an incomplete download, remove the file above.)
 

This PR fixes that.