Updated Netty to 4.1.72

[nicknezis]

Motivation
Netty versions prior to 4.1.71 are vulnerable to CVE-2021-43797
https://nvd.nist.gov/vuln/detail/CVE-2021-43797

Netty release notes:

• https://netty.io/news/2021/10/11/4-1-69-Final.html
• https://netty.io/news/2021/10/11/4-1-70-Final.html
• https://netty.io/news/2021/12/09/4-1-71-Final.html
• https://netty.io/news/2021/12/13/4-1-72-Final.html

Changes

• Upgraded Netty libraries to 4.1.72.Final
• Upgraded netty-tcnative-boringssl-static to 2.0.46.Final which is compatible with Netty 4.1.72.Final

[nicknezis]

Will merge once #3753 is merged.

[nicknezis]

Update is similar to the one found here: apache/bookkeeper#2951

[surahman]

I had a quick look through the issue trackers for 4.1.71 and 4.1.72 and there should be no issues with the upgrade.