Bump dnspython from 2.2.1 to 2.3.0 (#1975)

* Bump dnspython from 2.2.1 to 2.3.0

Bumps [dnspython](https://github.com/rthalley/dnspython) from 2.2.1 to 2.3.0.
- [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/v2.2.1...v2.3.0)

---
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==2.3.0

---------

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/immutable.py

@@ -1,32 +1,25 @@
 # Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
 
-import collections.abc
-import sys
+from typing import Any
 
-# pylint: disable=unused-import
-if sys.version_info >= (3, 7):
-    odict = dict
-    from dns._immutable_ctx import immutable
-else:
-    # pragma: no cover
-    from collections import OrderedDict as odict
-    from dns._immutable_attr import immutable  # noqa
-# pylint: enable=unused-import
+import collections.abc
+
+from dns._immutable_ctx import immutable
 
 
 @immutable
-class Dict(collections.abc.Mapping):
-    def __init__(self, dictionary, no_copy=False):
+class Dict(collections.abc.Mapping):  # lgtm[py/missing-equals]
+    def __init__(self, dictionary: Any, no_copy: bool = False):
         """Make an immutable dictionary from the specified dictionary.
 
         If *no_copy* is `True`, then *dictionary* will be wrapped instead
         of copied.  Only set this if you are sure there will be no external
         references to the dictionary.
         """
-        if no_copy and isinstance(dictionary, odict):
+        if no_copy and isinstance(dictionary, dict):
             self._odict = dictionary
         else:
-            self._odict = odict(dictionary)
+            self._odict = dict(dictionary)
         self._hash = None
 
     def __getitem__(self, key):
@@ -37,7 +30,7 @@ class Dict(collections.abc.Mapping):
             h = 0
             for key in sorted(self._odict.keys()):
                 h ^= hash(key)
-            object.__setattr__(self, '_hash', h)
+            object.__setattr__(self, "_hash", h)
         # this does return an int, but pylint doesn't figure that out
         return self._hash
 
@@ -48,7 +41,7 @@ class Dict(collections.abc.Mapping):
         return iter(self._odict)
 
 
-def constify(o):
+def constify(o: Any) -> Any:
     """
     Convert mutable types to immutable types.
     """
@@ -63,7 +56,7 @@ def constify(o):
     if isinstance(o, list):
         return tuple(constify(elt) for elt in o)
     if isinstance(o, dict):
-        cdict = odict()
+        cdict = dict()
         for k, v in o.items():
             cdict[k] = constify(v)
         return Dict(cdict, True)