Update dependency mypy to v1.20.2 (#9599)

.ci/requirements-mypy.txt

@@ -1,4 +1,4 @@
-mypy==1.19.1
+mypy==1.20.2
 arro3-compute
 arro3-core
 IceSpringPySideStubs-PyQt6

Tests/test_image.py

@@ -862,7 +862,7 @@ class TestImage:
     def test_exif_webp(self, tmp_path: Path) -> None:
         with Image.open("Tests/images/hopper.webp") as im:
             exif = im.getexif()
-            assert exif == {}
+            assert dict(exif) == {}
 
             out = tmp_path / "temp.webp"
             exif[258] = 8
@@ -884,7 +884,7 @@ class TestImage:
     def test_exif_png(self, tmp_path: Path) -> None:
         with Image.open("Tests/images/exif.png") as im:
             exif = im.getexif()
-            assert exif == {274: 1}
+            assert dict(exif) == {274: 1}
 
             out = tmp_path / "temp.png"
             exif[258] = 8

src/PIL/Image.py

@@ -2639,11 +2639,8 @@ class Image:
         if is_path(fp):
             filename = os.fspath(fp)
             open_fp = True
-        elif fp == sys.stdout:
-            try:
-                fp = sys.stdout.buffer
-            except AttributeError:
-                pass
+        elif fp == sys.stdout and isinstance(sys.stdout, io.TextIOWrapper):
+            fp = sys.stdout.buffer
         if not filename and hasattr(fp, "name") and is_path(fp.name):
             # only set the name for metadata purposes
             filename = os.fspath(fp.name)