ci: use the native libcst parser (#969)

Use the native libcst parser. Its not yet compatiable with all 3.10 and
3.11 features (eg match statements and the new union format), but that's
okay, as we're compatible with python 3.8 and so we don't use those
features.

This should result in codemods being faster both locally and in ci.

noxfile.py

@@ -19,7 +19,14 @@
 
 
 # see https://pdm.fming.dev/latest/usage/advanced/#use-nox-as-the-runner
-os.environ.update({"PDM_IGNORE_SAVED_PYTHON": "1"})
+os.environ.update(
+    {
+        "PDM_IGNORE_SAVED_PYTHON": "1",
+    },
+)
+# support the python parser in case the native parser isn't available
+os.environ.setdefault("LIBCST_PARSER_TYPE", "native")
+
 
 nox.options.error_on_external_run = True
 nox.options.reuse_existing_virtualenvs = True
@@ -139,22 +146,36 @@ def autotyping(session: nox.Session) -> None:
                         posargs += options
                         break
 
-        session.run(*base_command, *posargs)
+        session.run(
+            *base_command,
+            *posargs,
+        )
         return
 
     # run the custom fixers
     for module, options in dir_options.items():
-        session.run(*base_command, *module, *options)
+        session.run(
+            *base_command,
+            *module,
+            *options,
+        )
 
 
 @nox.session(name="codemod")
 def codemod(session: nox.Session) -> None:
     """Run libcst codemods."""
     session.run_always("pdm", "install", "-dG", "codemod", external=True)
+
     if session.posargs and session.posargs[0] == "run-all" or not session.interactive:
         # run all of the transformers on disnake
         session.log("Running all transformers.")
-        res: str = session.run("python", "-m", "libcst.tool", "list", silent=True)  # type: ignore
+        res: str = session.run(
+            "python",
+            "-m",
+            "libcst.tool",
+            "list",
+            silent=True,
+        )  # type: ignore
         transformers = [line.split("-")[0].strip() for line in res.splitlines()]
         session.log("Transformers: " + ", ".join(transformers))
 
@@ -185,7 +206,12 @@ def codemod(session: nox.Session) -> None:
                 *session.posargs,
             )
         else:
-            session.run("python", "-m", "libcst.tool", "list")
+            session.run(
+                "python",
+                "-m",
+                "libcst.tool",
+                "list",
+            )
     if not session.interactive:
         session.notify("autotyping", posargs=[])