Increase memory for war assembly

[timja]

See JENKINS-XXXXX.

jenkins-infra/helpdesk#3874 (comment)

Not sure why but lets see if builds are stabler with this.

Testing done

Proposed changelog entries

• JENKINS-XXXXX, human-readable text

Proposed upgrade guidelines

N/A

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@mention

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[MarkEWaite]

The tests in the following draft pull requests show that without this change, the issue happens infrequently, but happens. With this change, the failure did not happen in 12 builds.

• Test Linux with JDK 21 #8848
• Test Linux with JDK 21 #8849
• Test Linux with JDK 21 #8850
• Test Linux with JDK 21 #8851

[MarkEWaite]

Will need to be backported to stable-2.426

[timja]

My build finally passed after failing ~5 times before this change, #8832 😄