…ssets (#1014)

Create install_only assets for the free-threaded builds of Python 3.13+.
This is in addition to the install_only assets for the GIL configuration
of these builds.
These assets are upload to a GitHub release by the appropriate action. 

Based upon #537

Closes #536

Patch OpenSSL to allow reading configurations which contain the
RHEL/Fedora specific 'rh-allow-sha1-signatures' configuration value.
This is does change the behavior of OpenSSL based on the value of this
setting.

closes #999

…#1021)

Fixes astral-sh/uv#18609

This removes the dependency on openssl / pkg-config. This in turn avoids
~30s of overhead on the crate build CI job to install these
dependencies.

While I was here I ran `cargo update` to pull in newer versions of
various dependencies. I also removed some unused dependencies from
`Cargo.toml`.

Default runners have 2 CPUs. We can achieve a nice speed-up (but not
quite linear) by leveraging runners with more CPUs.