Final field has been mutated reflectively warnings with JDK 26

[sormuras]

Steps to reproduce

• https://github.com/junit-team/junit-framework/actions/runs/19594798022/job/56117977317

WARNING: Use --enable-final-field-mutation=ALL-UNNAMED to avoid a warning
WARNING: Mutating final fields will be blocked in a future release unless final field mutation is enabled

WARNING: Final field selectedUris in class
  org.junit.platform.console.options.TestDiscoveryOptionsMixin$SelectorOptions
has been mutated reflectively by class
  org.junit.platform.console.shadow.picocli.CommandLine$Model$FieldBinding
in unnamed module @769c9116 (file:/.../junit-platform-console-standalone-6.1.0-SNAPSHOT.jar)

WARNING: Final field _cipher in class
  org.sonatype.plexus.components.sec.dispatcher.DefaultSecDispatcher
has been mutated reflectively by class
  org.eclipse.sisu.bean.BeanPropertyField
in unnamed module @501edcf1 (file:/.../apache-maven-3.9.11/lib/org.eclipse.sisu.inject-0.9.0.M4.jar

Context

Latest

• JEP 500: Prepare to Make Final Mean Final
• https://openjdk.org/jeps/8305968#Embracing-integrity-by-default
• https://www.youtube.com/watch?v=bdHkbEIdBAs

Deliverables

• Remove final modifiers from sources under our control
• Permit mutation for the time being - and update dependencies where possible