Update crates (#4074)

* Remove another header for websocket connections

* Fix small bake issue

* Update crates

Updated crates and adjusted code where needed.
One major update is Rocket rc4, no need anymore (again) for crates.io patching.

The only item still pending is openssl/openssl-sys for which we need to
wait if https://github.com/sfackler/rust-openssl/pull/2094 will be
merged. If, then we can remove the pinned versions for the openssl crate.

src/util.rs

@@ -46,6 +46,7 @@ impl Fairing for AppHeaders {
                     // Remove headers which could cause websocket connection issues
                     res.remove_header("X-Frame-Options");
                     res.remove_header("X-Content-Type-Options");
+                    res.remove_header("Permissions-Policy");
                     return;
                 }
                 (_, _) => (),