Bump org.jenkins-ci.main:jenkins-test-harness from 2250.v03a_1295b_0a_30 to 2254.vcff7a_d4969e5

Bump org.jenkins-ci.main:jenkins-test-harness from 2250.v03a_1295b_0a_30 to 2254.vcff7a_d4969e5 #21