release 5.0.1 made an incompatible API change

[zeitlinger]

This PR breaks prometheus/client_java#1430

Here: https://github.com/prometheus/client_java/blob/6c82338f1defdd0c45a482fa1e954da8a13043ab/prometheus-metrics-instrumentation-dropwizard5/src/test/java/io/prometheus/metrics/instrumentation/dropwizard5/DropwizardExportsTest.java#L84-L88

Maybe 4.x was released as 5.0 before

[zeitlinger]

BTW - we use 5.0.0 since last year prometheus/client_java#912

[joschi]

The artifacts of Dropwizard Metrics 5.0.0 were accidentally released years ago and were never meant for public consumption.

Sorry for the breaking change, but it was intentional this time.