[SPARK-36729][BUILD] Upgrade Netty from 4.1.63 to 4.1.68

### What changes were proposed in this pull request?

This PR upgrades Netty from `4.1.63` to `4.1.68`.

All the changes from `4.1.64` to `4.1.68` are as follows.

* 4.1.64 and 4.1.65
  * https://netty.io/news/2021/05/19/4-1-65-Final.html
* 4.1.66
  * https://netty.io/news/2021/07/16/4-1-66-Final.html
* 4.1.67
  * https://netty.io/news/2021/08/16/4-1-67-Final.html
* 4.1.68
  * https://netty.io/news/2021/09/09/4-1-68-Final.html

### Why are the changes needed?

Recently Netty `4.1.68` was released, which includes official M1 Mac support.
* Add support for mac m1
  * netty/netty#11666

`4.1.65` also includes a critical bug fix which Spark might be affected.
* JNI classloader deadlock with latest JDK version
  * netty/netty#11209

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

CIs.

Closes #33970 from sarutak/upgrade-netty-4.1.68.

Authored-by: Kousuke Saruta <sarutak@oss.nttdata.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

dev/deps/spark-deps-hadoop-2.7-hive-2.3

@@ -190,7 +190,7 @@ metrics-jmx/4.2.2//metrics-jmx-4.2.2.jar
 metrics-json/4.2.2//metrics-json-4.2.2.jar
 metrics-jvm/4.2.2//metrics-jvm-4.2.2.jar
 minlog/1.3.0//minlog-1.3.0.jar
-netty-all/4.1.63.Final//netty-all-4.1.63.Final.jar
+netty-all/4.1.68.Final//netty-all-4.1.68.Final.jar
 objenesis/2.6//objenesis-2.6.jar
 okhttp/3.12.12//okhttp-3.12.12.jar
 okio/1.14.0//okio-1.14.0.jar

dev/deps/spark-deps-hadoop-3.2-hive-2.3

@@ -161,7 +161,7 @@ metrics-jmx/4.2.2//metrics-jmx-4.2.2.jar
 metrics-json/4.2.2//metrics-json-4.2.2.jar
 metrics-jvm/4.2.2//metrics-jvm-4.2.2.jar
 minlog/1.3.0//minlog-1.3.0.jar
-netty-all/4.1.63.Final//netty-all-4.1.63.Final.jar
+netty-all/4.1.68.Final//netty-all-4.1.68.Final.jar
 objenesis/2.6//objenesis-2.6.jar
 okhttp/3.12.12//okhttp-3.12.12.jar
 okio/1.14.0//okio-1.14.0.jar

pom.xml

@@ -754,7 +754,7 @@
       <dependency>
         <groupId>io.netty</groupId>
         <artifactId>netty-all</artifactId>
-        <version>4.1.63.Final</version>
+        <version>4.1.68.Final</version>
       </dependency>
       <dependency>
         <groupId>org.apache.derby</groupId>