Updated return type

Author: radarhere

Tests/test_file_mpo.py

@@ -316,7 +316,7 @@ def test_save_xmp() -> None:
     im = Image.new("RGB", (1, 1))
     im2 = Image.new("RGB", (1, 1), "#f00")
 
-    def roundtrip_xmp():
+    def roundtrip_xmp() -> list[Any]:
         im_reloaded = roundtrip(im, xmp=b"Default", save_all=True, append_images=[im2])
         xmp = [im_reloaded.info["xmp"]]
         im_reloaded.seek(1)

src/PIL/Image.py

@@ -2600,7 +2600,7 @@ def save(
         if open_fp:
             fp.close()
 
-    def _attach_default_encoderinfo(self, im: Image) -> Any:
+    def _attach_default_encoderinfo(self, im: Image) -> dict[str, Any]:
         encoderinfo = getattr(self, "encoderinfo", {})
         self.encoderinfo = {**im._default_encoderinfo, **encoderinfo}
         return encoderinfo