This reverts commit 2864f0696b9c1225272e3d5782b48d107a815aaa.

A tentative measures fo https://github.com/ruby/openssl/issues/606.

With OpenSSL 3.1.0, the error message at connection using "self-signed
certificate" seems to return `SSL_R_TLSV1_ALERT_UNKNOWN_CA` instead of
`SSL_R_CERTIFICATE_VERIFY_FAILED`.

https://github.com/ruby/openssl/commit/fc4629d246

This reverts commit 279fb0083a9c9fd4423068cb738762c7a169c9cc.

https://github.com/ruby/net-http/commit/5544243c41

RFC 2986, section 4.1 only defines version 1 for CSRs. This version
is encoded as a 0. Starting with OpenSSL 3.3, setting the CSR version
to anything but 1 fails.

Do not attempt to generate a CSR with invalid version (which now fails)
and invalidate the CSR in test_sign_and_verify_rsa_sha1 by changing its
subject rather than using an invalid version.

This commit fixes the following error.

```
 2) Error: test_version(OpenSSL::TestX509Request): OpenSSL::X509::RequestError:
X509_REQ_set_version: passed invalid argument
/home/runner/work/openssl/openssl/test/openssl/test_x509req.rb:18:in `version='
/home/runner/work/openssl/openssl/test/openssl/test_x509req.rb:18:in `issue_csr'
/home/runner/work/openssl/openssl/test/openssl/test_x509req.rb:43:in
`test_version'
     40:     req = OpenSSL::X509::Request.new(req.to_der)
     41:     assert_equal(0, req.version)
     42:
  => 43:     req = issue_csr(1, @dn, @rsa1024, OpenSSL::Digest.new('SHA256'))
     44:     assert_equal(1, req.version)
     45:     req = OpenSSL::X509::Request.new(req.to_der)
     46:     assert_equal(1, req.version)
```

https://github.com/ruby/openssl/commit/c06fdeb091

These test failures first appeared on irrelevant changes. It probably
came from changes in GitHub Actions instead of CRuby's.

Until we figure out how to fix these tests, let's skip them to make the
CI usable.