Fix transformJson mis-encoding. (#240)

Signed-off-by: 秋雨落 <[email protected]>

src/main/java/net/fabricmc/loom/util/ZipUtils.java

@@ -211,7 +211,7 @@ public static <T> int transformJson(Class<T> typeOfT, Path zip, Stream<Pair<Stri
 	}
 
 	public static <T> int transformJson(Class<T> typeOfT, Path zip, Map<String, UnsafeUnaryOperator<T>> transforms) throws IOException {
-		return transformMapped(zip, transforms, bytes -> LoomGradlePlugin.GSON.fromJson(new InputStreamReader(new ByteArrayInputStream(bytes)), typeOfT),
+		return transformMapped(zip, transforms, bytes -> LoomGradlePlugin.GSON.fromJson(new InputStreamReader(new ByteArrayInputStream(bytes), StandardCharsets.UTF_8), typeOfT),
 				s -> LoomGradlePlugin.GSON.toJson(s, typeOfT).getBytes(StandardCharsets.UTF_8));
 	}