Use default cancellation token

Author: JimBobSquarePants

src/ImageSharp/Formats/ImageDecoder.cs

@@ -30,7 +30,7 @@ public Image Decode(DecoderOptions options, Stream stream)
               s => this.Decode(options, s, default));
 
     /// <inheritdoc/>
-    public Task<Image<TPixel>> DecodeAsync<TPixel>(DecoderOptions options, Stream stream, CancellationToken cancellationToken)
+    public Task<Image<TPixel>> DecodeAsync<TPixel>(DecoderOptions options, Stream stream, CancellationToken cancellationToken = default)
         where TPixel : unmanaged, IPixel<TPixel>
         => WithSeekableStreamAsync(
             options,
@@ -39,7 +39,7 @@ public Task<Image<TPixel>> DecodeAsync<TPixel>(DecoderOptions options, Stream st
             cancellationToken);
 
     /// <inheritdoc/>
-    public Task<Image> DecodeAsync(DecoderOptions options, Stream stream, CancellationToken cancellationToken)
+    public Task<Image> DecodeAsync(DecoderOptions options, Stream stream, CancellationToken cancellationToken = default)
         => WithSeekableStreamAsync(
             options,
             stream,
@@ -54,7 +54,7 @@ public IImageInfo Identify(DecoderOptions options, Stream stream)
               s => this.Identify(options, s, default));
 
     /// <inheritdoc/>
-    public Task<IImageInfo> IdentifyAsync(DecoderOptions options, Stream stream, CancellationToken cancellationToken)
+    public Task<IImageInfo> IdentifyAsync(DecoderOptions options, Stream stream, CancellationToken cancellationToken = default)
          => WithSeekableStreamAsync(
              options,
              stream,

src/ImageSharp/Formats/ImageEncoder.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using SixLabors.ImageSharp.Advanced;
@@ -22,7 +22,7 @@ public void Encode<TPixel>(Image<TPixel> image, Stream stream)
          => this.EncodeWithSeekableStream(image, stream, default);
 
     /// <inheritdoc/>
-    public Task EncodeAsync<TPixel>(Image<TPixel> image, Stream stream, CancellationToken cancellationToken)
+    public Task EncodeAsync<TPixel>(Image<TPixel> image, Stream stream, CancellationToken cancellationToken = default)
         where TPixel : unmanaged, IPixel<TPixel>
         => this.EncodeWithSeekableStreamAsync(image, stream, cancellationToken);