Require font parameter in FreeTypeFont and truetype()

[radarhere]

Currently, font is an optional parameter for FreeTypeFont and truetype().

Pillow/src/PIL/ImageFont.py

Lines 198 to 211 in 6dd4b3c

	class FreeTypeFont:
	"""FreeType font wrapper (requires _imagingft service)"""
	font: Font
	font_bytes: bytes
	def __init__(
	self,
	font: StrOrBytesPath | BinaryIO | None = None,
	size: float = 10,
	index: int = 0,
	encoding: str = "",
	layout_engine: Layout | None = None,
	) -> None:

Pillow/src/PIL/ImageFont.py

Lines 758 to 764 in 6dd4b3c

	def truetype(
	font: StrOrBytesPath | BinaryIO | None = None,
	size: float = 10,
	index: int = 0,
	encoding: str = "",
	layout_engine: Layout | None = None,
	) -> FreeTypeFont:

However, if it is None, then an error is raised.

>>> from PIL import ImageFont
>>> ImageFont.FreeTypeFont()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "PIL/ImageFont.py", line 261, in __init__
    load_from_bytes(font)
  File "PIL/ImageFont.py", line 240, in load_from_bytes
    self.font_bytes = f.read()
AttributeError: 'NoneType' object has no attribute 'read'

>>> from PIL import ImageFont
>>> ImageFont.truetype()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "PIL/ImageFont.py", line 834, in truetype
    return freetype(font)
  File "PIL/ImageFont.py", line 831, in freetype
    return FreeTypeFont(font, size, index, encoding, layout_engine)
  File "PIL/ImageFont.py", line 261, in __init__
    load_from_bytes(font)
  File "PIL/ImageFont.py", line 240, in load_from_bytes
    self.font_bytes = f.read()
AttributeError: 'NoneType' object has no attribute 'read'

This PR removes the defaults to make it required instead.