Switch to rustls and webpki-roots (#30025)

This change replaces OpenSSL with rustls and also the manually curated
CA certs file with webpki-roots (effectively the same thing, but as a
crate).

Generally speaking the design of the network stack is the same. Changes:

- Code around certificate overrides needed to be refactored to work with
  rustls so the various thread-safe list of certificates is refactored
  into `CertificateErrorOverrideManager`
- hyper-rustls takes care of setting ALPN protocols for HTTP requests,
  so for WebSockets this is moved to the WebSocket code.
- The safe set of cypher suites is chosen, which seem to correspond to
  the "Modern" configuration from [1]. This can be adjusted later.
- Instead of passing a string of PEM CA certificates around, an enum is
  used that includes parsed Certificates (or the default which reads
  them from webpki-roots).
- Code for starting up an SSL server for testing is cleaned up a little,
  due to the fact that the certificates need to be overriden explicitly
  now. This is due to the fact that the `webpki` crate is more stringent
  with self-signed certificates than SSL (CA certificates cannot used as
  end-entity certificates). [2]

1. https://wiki.mozilla.org/Security/Server_Side_TLS
2. https://github.com/briansmith/webpki/issues/114

Fixes #7888.
Fixes #13749.
Fixes #26835.
Fixes #29291.

1 files changed, 0 insertions, 1 deletions

diff --git a/python/servo/platform/windows.py b/python/servo/platform/windows.py
index ddd283db72d..02d013bafc6 100644
--- a/python/servo/platform/windows.py
+++ b/python/servo/platform/windows.py
@@ -21,7 +21,6 @@ DEPS_URL = "https://github.com/servo/servo-build-deps/releases/download/msvc-dep
 DEPENDENCIES = {
     "llvm": "15.0.5",
     "moztools": "3.2",
-    "openssl": "111.3.0+1.1.1c-vs2017-2019-09-18",
 }
 
 URL_BASE = "https://gstreamer.freedesktop.org/data/pkg/windows/1.16.0/"