Update GitHub Actions workflows to set OSSL_TEST_ALL=1.

Exclude a few slow tests that are not critical for local development,
unless OSSL_TEST_ALL=1 is set. The bindings code paths are still reached
by other tests with smaller inputs, and failures in those would likely
indicate an issue in OpenSSL rather than in the bindings.

Newly excluded tests include generating large DSA keys and measuring
CRYPTO_memcmp() timing. These tests currently take nearly half of the
total runtime.

https://github.com/ruby/openssl/commit/382eca2aec

The SSL SESSION files we were originally testing against use DHE and
SSLv3. AWS-LC happens to have no support for either and we have newer
possible alternatives available, so I've updated the respective
files to use ECDHE-RSA-AES256-SHA with TLS 1.1 and 1.2. I've verified
that these work as expected with all libcryptos we support.

There are also a few SSL session discrepencies in AWS-LC when
compared to OpenSSL.

1. AWS-LC has no support for internal session caching on the
   client-end.
2. AWS-LC supports internal session caching on the server, but
   SSL_get1_session does not return a resumable session with TLS 1.3
   in AWS-LC. Users have to use the SSL_CTX_sess_set_new_cb
   (ctx.session_new_cb in Ruby) to retrieve the resumable session
   ticket.
3. AWS-LC has no current support for external session caching in TLS
   1.3.

https://github.com/ruby/openssl/commit/ca384b8e2f

Avoid using the deprecated OpenSSL::SSL::SSLContext#ssl_version= outside
the tests specifically written for it.

https://github.com/ruby/openssl/commit/93a564dec2

Drop support for OpenSSL 1.1.0. OpenSSL 1.1.0 was a non-LTS release and
it has reached upstream EOL in 2019-12 along with OpenSSL 1.0.2.
Distributions that shipped with OpenSSL 1.1.0 include:

 - Debian 9 (EOL 2022-06)
 - Ubuntu 18.04 LTS (EOL 2023-04)

https://github.com/ruby/openssl/commit/ba83abe920

Drop support for LibreSSL 3.1-3.8. LibreSSL 3.8 has reached its EOL in
2024-10.

https://github.com/ruby/openssl/commit/f33d611f9f

In the test case, the client raises an exception in the session_new_cb
and may not cleanly close the connection. Let's ignore exceptions raised
at the server side.

Fixes: https://github.com/ruby/openssl/issues/828

https://github.com/ruby/openssl/commit/210ba0334a

Check the ID_callback_state ivar after SSL_read() or SSL_write()
returns, similar to what ossl_start_ssl() does.

Previously, callbacks that can raise a Ruby exception were only called
from ossl_start_ssl(). This has changed in OpenSSL 1.1.1. Particularly,
the session_new_cb will be called whenever a client receives a
NewSessionTicket message, which can happen at any time during a TLS 1.3
connection.

https://github.com/ruby/openssl/commit/aac9ce1304

(https://github.com/ruby/openssl/pull/586)

String#unpack1 avoids the intermediate array created by String#unpack
for single elements, while also making a call to Array#first/[0]
unnecessary.

https://github.com/ruby/openssl/commit/8eb0715a42

https://github.com/ruby/openssl/commit/a3d230d4e0

Current versions of OpenSSL and LibreSSL all support TLS 1.2, so there
is no need for checking the availability.

https://github.com/ruby/openssl/commit/a175a41529