[MacPorts] #50255: gnutls @3.3.19_0: update to 3.3.20

[MacPorts]

#50255: gnutls @3.3.19_0: update to 3.3.20
---------------------------------+--------------------------------
 Reporter:  mschamschula@…       |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.4
 Keywords:  haspatch maintainer  |       Port:  gnutls
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 gnutls has been updated to version 3.3.20. New this version:

 * libgnutls: Corrected memory leak in gnutls_pubkey_import_privkey() when
 used with PKCS #11 keys.
 * libgnutls: For DSA and ECDSA keys in PKCS #11 objects, import their
 public keys from either a public key object or a certificate. That is,
 because private keys do not contain all the required parameters for a
 direct import.
 * libgnutls: Fixed issue when writing ECDSA private keys in PKCS #11
 tokens.
 * libgnutls: Fixed out-of-bounds read in
 gnutls_x509_ext_export_key_usage().
 * libgnutls: Handle DNS name constraints with a leading dot. Backported
 from 3.4.x branch.
 * libgnutls: The max-record extension is no longer negotiated on DTLS.
 This resolves issue with the max-record being negotiated but ignored.

 ** API and ABI modifications:

 * No changes since last version.

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Ticket URL: <https://trac.macports.org/ticket/50255>
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