Fix: UNet2DModel::__init__ type hints; fixes issue huggingface#4806 (huggingface#7175)

Co-authored-by: Sayak Paul <[email protected]>

Author: fpgaminer

src/diffusers/models/unets/unet_2d.py

@@ -99,9 +99,9 @@ def __init__(
         time_embedding_type: str = "positional",
         freq_shift: int = 0,
         flip_sin_to_cos: bool = True,
-        down_block_types: Tuple[str] = ("DownBlock2D", "AttnDownBlock2D", "AttnDownBlock2D", "AttnDownBlock2D"),
-        up_block_types: Tuple[str] = ("AttnUpBlock2D", "AttnUpBlock2D", "AttnUpBlock2D", "UpBlock2D"),
-        block_out_channels: Tuple[int] = (224, 448, 672, 896),
+        down_block_types: Tuple[str, ...] = ("DownBlock2D", "AttnDownBlock2D", "AttnDownBlock2D", "AttnDownBlock2D"),
+        up_block_types: Tuple[str, ...] = ("AttnUpBlock2D", "AttnUpBlock2D", "AttnUpBlock2D", "UpBlock2D"),
+        block_out_channels: Tuple[int, ...] = (224, 448, 672, 896),
         layers_per_block: int = 2,
         mid_block_scale_factor: float = 1,
         downsample_padding: int = 1,