Update session key decryption to not allow SED packets #255
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To protect SEIPDv1 encrypted messages, SED packets should not be allowed in decryption.
Although the decryption functions with pgp keys in gopenpgp do not allow SED packets, the decrypt with session key function allowed such packets without returning an error.
This PR addresses this issue by not allowing non-integrity protected packets in the decrypt with a session key functions.