Update Netty to 4.1.61.Final

Author: dagnir

.changes/next-release/feature-NettyNIOHTTPClient-af58a9c.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Netty NIO HTTP Client",
+    "contributor": "",
+    "description": "Update Netty dependency to `4.1.61.Final`."
+}

pom.xml

@@ -99,7 +99,7 @@
         <equalsverifier.version>3.5</equalsverifier.version>
         <!-- Update netty-open-ssl-version accordingly whenever we update netty version-->
         <!-- https://github.com/netty/netty/blob/4.1/pom.xml#L384 -->
-        <netty.version>4.1.60.Final</netty.version>
+        <netty.version>4.1.61.Final</netty.version>
         <unitils.version>3.3</unitils.version>
         <xmlunit.version>1.3</xmlunit.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>