Windows Ruby 3.3: Workaround: Set OPENSSL_MODULES to find providers.

[junaruga]

This PR is a workaround to pass the following failing tests addressed on #711. So, this PR technically fixes #711. The issue is that OpenSSL couldn't find the lib\ossl-modules\legacy.dll. The openssl/openssl#19368 was helpful to understand teh issue and find the solution.

---

This commit is a workaround to avoid the following test failures by loading legacy provider.

2) Error: test_openssl_legacy_provider(OpenSSL::TestProvider): OpenSSL::Provider::ProviderError: Failed to load legacy provider: (null) (name=legacy)
D:/a/ruby-openssl/ruby-openssl/test/openssl/test_provider.rb:62:in `load'
D:/a/ruby-openssl/ruby-openssl/test/openssl/test_provider.rb:62:in `<main>'
D:/a/ruby-openssl/ruby-openssl/test/openssl/test_provider.rb:61:in `with_openssl'
D:/a/ruby-openssl/ruby-openssl/test/openssl/test_provider.rb:36:in `test_openssl_legacy_provider'
     33:   end
     34:
     35:   def test_openssl_legacy_provider
  => 36:     with_openssl(<<-'end;')
     37:       OpenSSL::Provider.load("legacy")
     38:       algo = "RC4"
     39:       data = "a" * 1000

I hope this logic is included in an Ruby installer used in GitHub Actions Windows cases.

By the way, I found

$ bin\openssl.exe list -provider legacy -providers

$HOME/.local/openssl-3.0.12-fips-debug-c3cc0f1386/bin/openssl list -provider legacy -providers
Providers:
  legacy
    name: OpenSSL Legacy Provider
    version: 3.0.12
    status: active

[junaruga]

The CI is green. Let me merge this PR to make the CI green immediately.
https://github.com/ruby/openssl/actions/runs/7494112180?pr=712