Update checkstyle to version 8.3

checkstyle.xml

@@ -41,6 +41,7 @@
 		</module>
 		<module name="WhitespaceAround"/>
 		<module name="UnusedImports"/>
+		<module name="SuppressionCommentFilter"/>
 	</module>
 	<module name="RegexpMultiline">
 		<property name="format" value="else[ \t]*[\r\n]+[ \t]*if"/>

http-api/src/main/java/net/runelite/http/api/xtea/XteaClient.java

@@ -88,7 +88,9 @@ public class XteaClient
 		try (ResponseBody body = response.body())
 		{
 			InputStream in = body.byteStream();
+			// CHECKSTYLE:OFF
 			return RuneliteAPI.GSON.fromJson(new InputStreamReader(in), new TypeToken<List<XteaKey>>() { }.getType());
+			// CHECKSTYLE:ON
 		}
 		catch (JsonParseException ex)
 		{

pom.xml

@@ -163,6 +163,13 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-checkstyle-plugin</artifactId>
 				<version>2.17</version>
+				<dependencies>
+					<dependency>
+						<groupId>com.puppycrawl.tools</groupId>
+						<artifactId>checkstyle</artifactId>
+						<version>8.3</version>
+					</dependency>
+				</dependencies>
 				<executions>
 					<execution>
 						<id>verify-style</id>