Revert current_date type to Any in ValidationContext

The field receives raw YAML data from commented_map.get() which can
be anything the user provides, not just Date | str | None. The
get_current_date function already handles arbitrary input defensively
with isinstance checks and falls back to Date.today().

src/rendercv/schema/models/validation_context.py

@@ -1,7 +1,7 @@
 import pathlib
 from dataclasses import dataclass
 from datetime import date as Date
-from typing import cast
+from typing import Any, cast
 
 import pydantic
 
@@ -9,7 +9,7 @@ import pydantic
 @dataclass
 class ValidationContext:
     input_file_path: pathlib.Path | None = None
-    current_date: Date | str | None = None
+    current_date: Any = None
 
 
 def get_input_file_path(info: pydantic.ValidationInfo) -> pathlib.Path | None: