[ruby/openssl] pkey: use OSSL_DECODER to load encrypted PEM on OpenSSL 3.0

OpenSSL 3.0 has rewritten routines to load pkeys (PEM_read_bio_* and
d2i_* functions) around the newly introduced OSSL_DECODER API.

This comes with a slight behavior change. They now decrypt and parse
each encountered PEM block, then check the kind of the block. This used
to be the reverse: they checked the PEM header to see the kind, and then
decrypted the content. This means that the password callback may now be
called repeatedly.

Let's use the OSSL_DECODER API directly on OpenSSL 3.0 so that the
return value from the password callback will be reused automatically.

https://github.com/ruby/openssl/commit/a84ea531bb

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