Update dependency org.jenkins-ci.main:jenkins-war to v2.481

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jenkins-ci.main:jenkins-war	2.480 -> 2.481

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[basil]

@janfaracik Looks like the code added in #1756 is failing on 2.480?

java.lang.IndexOutOfBoundsException: Index 1 out of bounds for length 1
	at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:100)
	at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:106)
	at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302)
	at java.base/java.util.Objects.checkIndex(Objects.java:385)
	at java.base/java.util.ArrayList.get(ArrayList.java:427)
	at org.jenkinsci.test.acceptance.plugins.ssh_slaves.SshSlaveLauncher.addCredential(SshSlaveLauncher.java:48)
	at org.jenkinsci.test.acceptance.plugins.ssh_slaves.SshSlaveLauncher.pwdCredentials(SshSlaveLauncher.java:80)
	at plugins.SshSlavesPluginTest.jvmOptions(SshSlavesPluginTest.java:234)