[JEP-231] teamconcert:2.4.0 was released with the commons-digester fix

[batmat]

Adjusts JEP-231 with the teamconcert release.

Cf. jenkinsci/jenkins#5320

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[basil]

Already taken care of in the PR preceding yours (#369).

[batmat]

superseded by https://github.com/jenkinsci/jep/pull/369/files