update to 3.21.0

python-dns-lexicon-tox-config.patch

@@ -1,5 +1,5 @@
 diff --git a/pyproject.toml b/pyproject.toml
-index d17fecc..be0c6e6 100644
+index 4122ff9..936bbdc 100644
 --- a/pyproject.toml
 +++ b/pyproject.toml
 @@ -126,8 +126,7 @@ extend-ignore = [ "E203", "E501" ]
@@ -9,6 +9,6 @@ index d17fecc..be0c6e6 100644
 -runner = "uv-venv-lock-runner"
 -with_dev = true
 +with_dev = false
- uv_sync_flags =  [ "--python={env_python}" ]  # Fix until https://github.com/tox-dev/tox-uv/issues/110 is fixed
  extras = [ "full" ]
  setenv.PYTEST_ADDOPTS = "--numprocesses auto"
+ setenv.PYTHONHASHSEED = "0"