[ruby/openssl] Remove test_ed25519_not_approved_on_fips.

This commit fixes the following failure on OpenSSL master FIPS case.

```
1) Failure: test_ed25519_not_approved_on_fips(OpenSSL::TestPKey): OpenSSL::PKey::PKeyError expected but nothing was raised.
/home/runner/work/openssl/openssl/vendor/bundle/ruby/3.0.0/gems/test-unit-ruby-core-1.0.6/lib/core_assertions.rb:462:in `assert_raise'
/home/runner/work/openssl/openssl/test/openssl/test_pkey.rb:174:in `test_ed25519_not_approved_on_fips'
     171:     MC4CAQAwBQYDK2VwBCIEIEzNCJso/5banbbDRuwRTg9bijGfNaumJNqM9u1PuKb7
     172:     -----END PRIVATE KEY-----
     173:     EOF
  => 174:     assert_raise(OpenSSL::PKey::PKeyError) do
     175:       OpenSSL::PKey.read(priv_pem)
     176:     end
     177:   end
```

Because FIPS compliance is a continually moving target. According to the [1],
FIPS 140-3 *currently* allows ED25519. The ED25519 is allowed again with the
latest OpenSSL FIPS by the commit [2], while it is not allowed in OpenSSL stable
version 3.x FIPS.

Remove this test because we want to keep our tests stable.

[1] https://github.com/openssl/openssl/discussions/22054
[2] https://github.com/openssl/openssl/commit/5f04124aab4a477d4e58149d8f04871ff7e5ea4b

https://github.com/ruby/openssl/commit/d43904b834

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