Bump dnspython from 2.4.2 to 2.6.1 (#2264)

* Bump dnspython from 2.4.2 to 2.6.1

Bumps [dnspython](https://github.com/rthalley/dnspython) from 2.4.2 to 2.6.1.
- [Release notes](https://github.com/rthalley/dnspython/releases)
- [Changelog](https://github.com/rthalley/dnspython/blob/main/doc/whatsnew.rst)
- [Commits](https://github.com/rthalley/dnspython/compare/v2.4.2...v2.6.1)

---
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==2.6.1

---------

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/ipv4.py

@@ -62,3 +62,16 @@ def inet_aton(text: Union[str, bytes]) -> bytes:
         return struct.pack("BBBB", *b)
     except Exception:
         raise dns.exception.SyntaxError
+
+
+def canonicalize(text: Union[str, bytes]) -> str:
+    """Verify that *address* is a valid text form IPv4 address and return its
+    canonical text form.
+
+    *text*, a ``str`` or ``bytes``, the IPv4 address in textual form.
+
+    Raises ``dns.exception.SyntaxError`` if the text is not valid.
+    """
+    # Note that inet_aton() only accepts canonial form, but we still run through
+    # inet_ntoa() to ensure the output is a str.
+    return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text))