Big diff: use lower-case list and dict (#5888)

stdlib/html/entities.pyi

@@ -1,6 +1,4 @@
-from typing import Dict
-
-name2codepoint: Dict[str, int]
-html5: Dict[str, str]
-codepoint2name: Dict[int, str]
-entitydefs: Dict[str, str]
+name2codepoint: dict[str, int]
+html5: dict[str, str]
+codepoint2name: dict[int, str]
+entitydefs: dict[str, str]