Most vulnerabilities do not derive from a single faulty tool or framework, but the incorrect combination of several (faulty or not!) tools over a sufficiently large attack surface.
How often are security flaws a subtle, complex thing that couldn't have been caught by a sensible type system? Almost all of the flaws we hear about, at least here, are the really simple dumb mistakes that a better language absolutely would have caught.
I would like to experience the next problem, please. If only for variety's sake.
But you don't get a lot of web application security advantages when you compare, say, Python and Java.
Of course, a very weak type system like PHP's can definitely introduce additional security flaws.
You can't accidentally forget to validate form parameters. It won't compile. This is pretty easy to do in Java. On the weaker side, I would assume php and python have something like perl's taint mode. It's such a simple thing and it avoids so many xss problems.