Use less specific types in validators args (#49)

Author: kalekseev

django-stubs/core/validators.pyi

@@ -1,7 +1,7 @@
 from datetime import datetime
 from decimal import Decimal
 from re import RegexFlag
-from typing import Any, Dict, List, Optional, Union, Pattern
+from typing import Any, Dict, List, Optional, Union, Pattern, Collection
 from uuid import UUID
 
 from django.core.files.base import File
@@ -38,7 +38,7 @@ class URLValidator(RegexValidator):
     tld_re: Any = ...
     host_re: Any = ...
     schemes: Any = ...
-    def __init__(self, schemes: Optional[List[str]] = ..., **kwargs: Any) -> None: ...
+    def __init__(self, schemes: Optional[Collection[str]] = ..., **kwargs: Any) -> None: ...
 
 integer_validator: Any
 
@@ -52,7 +52,7 @@ class EmailValidator:
     literal_regex: Any = ...
     domain_whitelist: Any = ...
     def __init__(
-        self, message: Optional[str] = ..., code: Optional[str] = ..., whitelist: Optional[List[str]] = ...
+        self, message: Optional[str] = ..., code: Optional[str] = ..., whitelist: Optional[Collection[str]] = ...
     ) -> None: ...
     def __call__(self, value: Optional[str]) -> None: ...
     def validate_domain_part(self, domain_part: str) -> bool: ...
@@ -119,7 +119,10 @@ class FileExtensionValidator:
     code: str = ...
     allowed_extensions: List[str] = ...
     def __init__(
-        self, allowed_extensions: Optional[List[str]] = ..., message: Optional[str] = ..., code: Optional[str] = ...
+        self,
+        allowed_extensions: Optional[Collection[str]] = ...,
+        message: Optional[str] = ...,
+        code: Optional[str] = ...,
     ) -> None: ...
     def __call__(self, value: File) -> None: ...