start version 4; update spring-boot, java,...

README.md

ozgcloud-common-dependencies/pom.xml

ozgcloud-common-lib/pom.xml

...a/de/ozgcloud/common/errorhandling/ExceptionUtilTest.java

...ozgcloud/common/errorhandling/TechnicalExceptionTest.java

...b/src/test/java/de/ozgcloud/common/grpc/GrpcUtilTest.java

...gcloud/common/logging/OzgCloudLoggingInterceptorTest.java

ozgcloud-common-parent/pom.xml

ozgcloud-common-pdf/pom.xml

ozgcloud-common-test/pom.xml

pom.xml