Use .any() instead of .collect()

[harmony7]

This gives type inference problems

        req.get_header_all("upgrade")
            .collect()
            .contains(&&HeaderValue::from_static("websocket"))

    Checking fastly-compute-project v0.1.0 (/Users/komuro/Developer/fastly/compute-starter-kit-rust-fanout-forward)
error[E0282]: type annotations needed
  --> src/main.rs:17:14
   |
17 |             .collect()
   |              ^^^^^^^ cannot infer type of the type parameter `B` declared on the method `collect`
   |
help: consider specifying the generic argument
   |
17 |             .collect::<Vec<_>>()
   |                     ++++++++++

For more information about this error, try `rustc --explain E0282`.

So replacing with

        req.get_header_all("upgrade")
            .any(|value| value == &HeaderValue::from_static("websocket")) {