Last week, Apple updated its Safari browser for Lion, Mountain Lion and Mavericks — but for the first time since 2010, did not include an update for the Snow Leopard version, last updated to 5.1.10. The move may signal that Apple is winding down support for the three-generations-back OS, which remains the third-most popular version of OS X behind the current version, Mavericks and 10.8 Mountain Lion (respectively)….