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/exception.py

@@ -140,6 +140,22 @@ class Timeout(DNSException):
         super().__init__(*args, **kwargs)
 
 
+class UnsupportedAlgorithm(DNSException):
+    """The DNSSEC algorithm is not supported."""
+
+
+class AlgorithmKeyMismatch(UnsupportedAlgorithm):
+    """The DNSSEC algorithm is not supported for the given key type."""
+
+
+class ValidationFailure(DNSException):
+    """The DNSSEC signature is invalid."""
+
+
+class DeniedByPolicy(DNSException):
+    """Denied by DNSSEC policy."""
+
+
 class ExceptionWrapper:
     def __init__(self, exception_class):
         self.exception_class = exception_class