HADOOP-19939. Upgrade to Jackson 2.18.9 due to security fixes

[pjfanning]

Description of PR

https://issues.apache.org/jira/browse/HADOOP-19939

How was this patch tested?

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

AI Tooling

If an AI tool was used:

• The PR includes the phrase "Contains content generated by "
  where is the name of the AI tool used.
• My use of AI contributions follows the ASF legal policy
  https://www.apache.org/legal/generative-tooling.html

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	7m 3s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	xmllint	0m 0s		xmllint was not available.
+0 🆗	shelldocs	0m 0s		Shelldocs was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	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.
			_ trunk Compile Tests _
+0 🆗	mvndep	1m 50s		Maven dependency ordering for branch
+1 💚	mvninstall	25m 59s		trunk passed
+1 💚	compile	8m 39s		trunk passed with JDK Ubuntu-21.0.11+10-1-24.04.2-Ubuntu
+1 💚	compile	8m 46s		trunk passed with JDK Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
+1 💚	mvnsite	9m 35s		trunk passed
+1 💚	javadoc	5m 59s		trunk passed with JDK Ubuntu-21.0.11+10-1-24.04.2-Ubuntu
+1 💚	javadoc	5m 56s		trunk passed with JDK Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
+1 💚	shadedclient	26m 40s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 22s		Maven dependency ordering for patch
+1 💚	mvninstall	20m 43s		the patch passed
+1 💚	compile	8m 34s		the patch passed with JDK Ubuntu-21.0.11+10-1-24.04.2-Ubuntu
+1 💚	javac	8m 34s		the patch passed
+1 💚	compile	8m 49s		the patch passed with JDK Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
+1 💚	javac	8m 49s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	9m 28s		the patch passed
+1 💚	shellcheck	0m 0s		No new issues.
+1 💚	javadoc	6m 0s		the patch passed with JDK Ubuntu-21.0.11+10-1-24.04.2-Ubuntu
+1 💚	javadoc	5m 58s		the patch passed with JDK Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
+1 💚	shadedclient	27m 53s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	642m 36s	/patch-unit-root.txt	root in the patch failed.
+1 💚	asflicense	1m 11s		The patch does not generate ASF License warnings.
		810m 41s

Reason	Tests
Failed junit tests	hadoop.hdfs.server.balancer.TestBalancerWithHANameNodes
	hadoop.yarn.applications.distributedshell.TestDSWithMultipleNodeManager
	hadoop.yarn.server.router.webapp.TestFederationWebApp
	hadoop.yarn.server.nodemanager.containermanager.logaggregation.TestLogAggregationService

Subsystem	Report/Notes
Docker	ClientAPI=1.55 ServerAPI=1.55 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8599/1/artifact/out/Dockerfile
GITHUB PR	#8599
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient codespell detsecrets xmllint shellcheck shelldocs
uname	Linux 4ef0c640b288 5.15.0-179-generic #189-Ubuntu SMP Tue May 5 18:20:56 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / dcd469a
Default Java	Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.11+10-1-24.04.2-Ubuntu /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8599/1/testReport/
Max. process+thread count	4550 (vs. ulimit of 10000)
modules	C: hadoop-project . U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8599/1/console
versions	git=2.43.0 maven=3.9.15 shellcheck=0.9.0
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[steveloughran]

are the test failures any way related to this change?