drop python3.6 support

python 3.6 reached end of life on 2021-12-23

Committed via https://github.com/asottile/all-repos

pre_commit_hooks/debug_statement_hook.py

@@ -1,9 +1,9 @@
+from __future__ import annotations
+
 import argparse
 import ast
 import traceback
-from typing import List
 from typing import NamedTuple
-from typing import Optional
 from typing import Sequence
 
 
@@ -29,7 +29,7 @@ class Debug(NamedTuple):
 
 class DebugStatementParser(ast.NodeVisitor):
     def __init__(self) -> None:
-        self.breakpoints: List[Debug] = []
+        self.breakpoints: list[Debug] = []
 
     def visit_Import(self, node: ast.Import) -> None:
         for name in node.names:
@@ -70,7 +70,7 @@ def check_file(filename: str) -> int:
     return int(bool(visitor.breakpoints))
 
 
-def main(argv: Optional[Sequence[str]] = None) -> int:
+def main(argv: Sequence[str] | None = None) -> int:
     parser = argparse.ArgumentParser()
     parser.add_argument('filenames', nargs='*', help='Filenames to run')
     args = parser.parse_args(argv)