Refactor: use stdlib and remove useless code (#86)

* Replace own code with stdlib's math.isclose

* Remove useless int casting

pydantic_extra_types/color.py

@@ -15,7 +15,7 @@
 from typing import Any, Callable, Tuple, Union, cast
 
 from pydantic import GetJsonSchemaHandler
-from pydantic._internal import _repr, _utils
+from pydantic._internal import _repr
 from pydantic.json_schema import JsonSchemaValue
 from pydantic_core import CoreSchema, PydanticCustomError, core_schema
 
@@ -430,7 +430,7 @@ def parse_float_alpha(value: None | str | float | int) -> float | None:
             'value is not a valid color: alpha values must be a valid float',
         )
 
-    if _utils.almost_equal_floats(alpha, 1):
+    if math.isclose(alpha, 1):
         return None
     elif 0 <= alpha <= 1:
         return alpha
@@ -479,11 +479,8 @@ def float_to_255(c: float) -> int:
 
     Returns:
         The integer equivalent of the given float value rounded to the nearest whole number.
-
-    Raises:
-        ValueError: If the given float value is outside the acceptable range of 0 to 1 (inclusive).
     """
-    return int(round(c * 255))
+    return round(c * 255)
 
 
 COLORS_BY_NAME = {