Convert font path on all platforms

Tests/test_imagefont.py

@@ -1,10 +1,10 @@
 import copy
-from pathlib import Path
 import os
 import re
 import shutil
 import sys
 from io import BytesIO
+from pathlib import Path
 
 import pytest
 from packaging.version import parse as parse_version

src/PIL/ImageFont.py

@@ -198,8 +198,8 @@ class FreeTypeFont:
             )
 
         if isPath(font):
+            font = os.fspath(font)
             if sys.platform == "win32":
-                font = os.fspath(font)
                 font_bytes_path = font if isinstance(font, bytes) else font.encode()
                 try:
                     font_bytes_path.decode("ascii")