Remove limit for dnspython after eventlet got fixed (#29004)

The eventlet/eventlet#782 fixed error that
caused the need to limit dnspython and eventlet 0.33.3 has been
released. We can now remove the limit
for dnspython as long as we also limit eventlet to >=0.33.3.

airflow/providers/apache/cassandra/provider.yaml

@@ -36,11 +36,6 @@ versions:
 dependencies:
   - apache-airflow>=2.3.0
   - cassandra-driver>=3.13.0
-  # dnspython 2.3.0 is not compatible with eventlet that cassandra-driver uses under-the-hood
-  # This can be removed when the issue is resolved (reported in two places):
-  # * https://github.com/eventlet/eventlet/issues/781
-  # * https://datastax-oss.atlassian.net/browse/PYTHON-1320
-  - dnspython<2.3.0
 
 integrations:
   - integration-name: Apache Cassandra

generated/provider_dependencies.json

@@ -53,8 +53,7 @@
   "apache.cassandra": {
     "deps": [
       "apache-airflow>=2.3.0",
-      "cassandra-driver>=3.13.0",
-      "dnspython<2.3.0"
+      "cassandra-driver>=3.13.0"
     ],
     "cross-providers-deps": []
   },

setup.py

@@ -216,12 +216,7 @@ def write_version(filename: str = str(AIRFLOW_SOURCES_ROOT / "airflow" / "git_ve
 # If you change this mark you should also change ./scripts/ci/check_order_setup.py
 # Start dependencies group
 async_packages = [
-    # dnspython 2.3.0 is not compatible with eventlet.
-    # This can be removed when the issue is resolved (reported in two places):
-    # * https://github.com/eventlet/eventlet/issues/781
-    # * https://datastax-oss.atlassian.net/browse/PYTHON-1320
-    "dnspython<2.3.0",
-    "eventlet>=0.9.7",
+    "eventlet>=0.33.3",
     "gevent>=0.13",
     "greenlet>=0.4.9",
 ]