Bump dnspython from 2.3.0 to 2.4.2 (#2123)

* Bump dnspython from 2.3.0 to 2.4.2

Bumps [dnspython](https://github.com/rthalley/dnspython) from 2.3.0 to 2.4.2.
- [Release notes](https://github.com/rthalley/dnspython/releases)
- [Changelog](https://github.com/rthalley/dnspython/blob/master/doc/whatsnew.rst)
- [Commits](https://github.com/rthalley/dnspython/compare/v2.3.0...v2.4.2)

---
updated-dependencies:
- dependency-name: dnspython
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update dnspython==2.4.2

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>

[skip ci]

lib/dns/dnssecalgs/eddsa.py

@@ -0,0 +1,65 @@
+from typing import Type
+
+from cryptography.hazmat.primitives import serialization
+from cryptography.hazmat.primitives.asymmetric import ed448, ed25519
+
+from dns.dnssecalgs.cryptography import CryptographyPrivateKey, CryptographyPublicKey
+from dns.dnssectypes import Algorithm
+from dns.rdtypes.ANY.DNSKEY import DNSKEY
+
+
+class PublicEDDSA(CryptographyPublicKey):
+    def verify(self, signature: bytes, data: bytes) -> None:
+        self.key.verify(signature, data)
+
+    def encode_key_bytes(self) -> bytes:
+        """Encode a public key per RFC 8080, section 3."""
+        return self.key.public_bytes(
+            encoding=serialization.Encoding.Raw, format=serialization.PublicFormat.Raw
+        )
+
+    @classmethod
+    def from_dnskey(cls, key: DNSKEY) -> "PublicEDDSA":
+        cls._ensure_algorithm_key_combination(key)
+        return cls(
+            key=cls.key_cls.from_public_bytes(key.key),
+        )
+
+
+class PrivateEDDSA(CryptographyPrivateKey):
+    public_cls: Type[PublicEDDSA]
+
+    def sign(self, data: bytes, verify: bool = False) -> bytes:
+        """Sign using a private key per RFC 8080, section 4."""
+        signature = self.key.sign(data)
+        if verify:
+            self.public_key().verify(signature, data)
+        return signature
+
+    @classmethod
+    def generate(cls) -> "PrivateEDDSA":
+        return cls(key=cls.key_cls.generate())
+
+
+class PublicED25519(PublicEDDSA):
+    key: ed25519.Ed25519PublicKey
+    key_cls = ed25519.Ed25519PublicKey
+    algorithm = Algorithm.ED25519
+
+
+class PrivateED25519(PrivateEDDSA):
+    key: ed25519.Ed25519PrivateKey
+    key_cls = ed25519.Ed25519PrivateKey
+    public_cls = PublicED25519
+
+
+class PublicED448(PublicEDDSA):
+    key: ed448.Ed448PublicKey
+    key_cls = ed448.Ed448PublicKey
+    algorithm = Algorithm.ED448
+
+
+class PrivateED448(PrivateEDDSA):
+    key: ed448.Ed448PrivateKey
+    key_cls = ed448.Ed448PrivateKey
+    public_cls = PublicED448