HBASE-26733 [hbase-thirdparty] Upgrade Netty to 4.1.73.Final

[apurtell]

Netty 4.1.71.Final included a fix for HTTP-request-smuggling. We are still on 4.1.70.Final.

Latest is 4.1.73.Final, use that.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 41s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
-0 ⚠️	test4tests	0m 0s	The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
		_ master Compile Tests _
+1 💚	mvninstall	1m 3s	master passed
+1 💚	compile	0m 11s	master passed
+1 💚	javadoc	0m 7s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 29s	the patch passed
+1 💚	compile	0m 10s	the patch passed
+1 💚	javac	0m 10s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	xml	0m 1s	The patch has no ill-formed XML file.
+1 💚	javadoc	0m 5s	the patch passed
		_ Other Tests _
+1 💚	unit	0m 38s	root in the patch passed.
+1 💚	asflicense	0m 8s	The patch does not generate ASF License warnings.
		3m 50s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-Thirdparty-PreCommit/job/PR-75/1/artifact/yetus-precommit-check/output/Dockerfile
GITHUB PR	#75
Optional Tests	dupname asflicense javac javadoc unit xml compile
uname	Linux d697ee98b21c 5.4.0-1025-aws #25~18.04.1-Ubuntu SMP Fri Sep 11 12:03:04 UTC 2020 x86_64 GNU/Linux
Build tool	maven
git revision	master / 15fc52e
Default Java	Oracle Corporation-1.8.0_282-b08
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-Thirdparty-PreCommit/job/PR-75/1/testReport/
Max. process+thread count	413 (vs. ulimit of 1000)
modules	C: . U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-Thirdparty-PreCommit/job/PR-75/1/console
versions	git=2.20.1
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