Fix access widener file hashcode calculation breaking caching.

When using transitive access wideners the mc jar would always be re-processed.

src/main/java/net/fabricmc/loom/configuration/accesswidener/AccessWidenerFile.java

@@ -28,6 +28,8 @@ import java.io.IOException;
 import java.io.UncheckedIOException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.Objects;
 
 import com.google.gson.Gson;
 import com.google.gson.JsonObject;
@@ -78,4 +80,11 @@ public record AccessWidenerFile(
 				content
 		);
 	}
+
+	@Override
+	public int hashCode() {
+		int result = Objects.hash(name, modId);
+		result = 31 * result + Arrays.hashCode(content);
+		return result;
+	}
 }