Bump ch.qos.logback:logback-core from 1.2.6 to 1.3.15 in /pmptest #2180

Job	Run time
build-maven-pmptest / maven-build	2m 57s
build-maven-pmp-ui / npm-build	1m 32s
sonar-analysis-pmp-ui	0s
pmp-ui / build-dockers	10s
build-pmptest-local	44s
sonar_analysis	0s
pmptest / build-dockers	35s
	5m 58s

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